chore(docs): add widgets info to the repo README (#3600)

* add widgets info to the repo README

* pr feedback from z

* pr feedback from w and z

* separate README.md and INTERFACE_README.md

* Update WIDGETS_README.md
Co-authored-by: Will Hennessy <hennessywill@gmail.com>
Co-authored-by: Will Hennessy <hennessywill@gmail.com>

INTERFACE_README.md

+# Uniswap Interface
+
+An open source interface for Uniswap -- a protocol for decentralized exchange of Ethereum tokens.
+
+- Website: [uniswap.org](https://uniswap.org/)
+- Interface: [app.uniswap.org](https://app.uniswap.org)
+- Docs: [uniswap.org/docs/](https://docs.uniswap.org/)
+- Twitter: [@Uniswap](https://twitter.com/Uniswap)
+- Reddit: [/r/Uniswap](https://www.reddit.com/r/Uniswap/)
+- Email: [contact@uniswap.org](mailto:contact@uniswap.org)
+- Discord: [Uniswap](https://discord.gg/FCfyBSbCU5)
+- Whitepapers:
+  - [V1](https://hackmd.io/C-DvwDSfSxuh-Gd4WKE_ig)
+  - [V2](https://uniswap.org/whitepaper.pdf)
+  - [V3](https://uniswap.org/whitepaper-v3.pdf)
+
+## Accessing the Uniswap Interface
+
+To access the Uniswap Interface, use an IPFS gateway link from the
+[latest release](https://github.com/Uniswap/uniswap-interface/releases/latest),
+or visit [app.uniswap.org](https://app.uniswap.org).
+
+## Unsupported tokens
+
+Check out `useUnsupportedTokenList()` in [src/state/lists/hooks.ts](./src/state/lists/hooks.ts) for blocking tokens in your instance of the interface.
+
+You can block an entire list of tokens by passing in a tokenlist like [here](./src/constants/lists.ts) or you can block specific tokens by adding them to [unsupported.tokenlist.json](./src/constants/tokenLists/unsupported.tokenlist.json).
+
+## Contributions
+
+For steps on local deployment, development, and code contribution, please see [CONTRIBUTING](./CONTRIBUTING.md).
+
+## Accessing Uniswap V2
+
+The Uniswap Interface supports swapping, adding liquidity, removing liquidity and migrating liquidity for Uniswap protocol V2.
+
+- Swap on Uniswap V2: https://app.uniswap.org/#/swap?use=v2
+- View V2 liquidity: https://app.uniswap.org/#/pool/v2
+- Add V2 liquidity: https://app.uniswap.org/#/add/v2
+- Migrate V2 liquidity to V3: https://app.uniswap.org/#/migrate/v2
+
+## Accessing Uniswap V1
+
+The Uniswap V1 interface for mainnet and testnets is accessible via IPFS gateways
+linked from the [v1.0.0 release](https://github.com/Uniswap/uniswap-interface/releases/tag/v1.0.0).

README.md

-# Uniswap Interface
+This repo is home to the Uniswap Widgets package and the web app interface [app.uniswap.org](https://app.uniswap.org).
 
-[![Unit Tests](https://github.com/Uniswap/uniswap-interface/actions/workflows/unit-tests.yaml/badge.svg)](https://github.com/Uniswap/uniswap-interface/actions/workflows/unit-tests.yaml)
-[![Integration Tests](https://github.com/Uniswap/uniswap-interface/actions/workflows/integration-tests.yaml/badge.svg)](https://github.com/Uniswap/uniswap-interface/actions/workflows/integration-tests.yaml)
-[![Lint](https://github.com/Uniswap/uniswap-interface/actions/workflows/lint.yml/badge.svg)](https://github.com/Uniswap/uniswap-interface/actions/workflows/lint.yml)
-[![Release](https://github.com/Uniswap/uniswap-interface/actions/workflows/release.yaml/badge.svg)](https://github.com/Uniswap/uniswap-interface/actions/workflows/release.yaml)
-[![Crowdin](https://badges.crowdin.net/uniswap-interface/localized.svg)](https://crowdin.com/project/uniswap-interface)
-
-An open source interface for Uniswap -- a protocol for decentralized exchange of Ethereum tokens.
-
-- Website: [uniswap.org](https://uniswap.org/)
-- Interface: [app.uniswap.org](https://app.uniswap.org)
-- Docs: [uniswap.org/docs/](https://docs.uniswap.org/)
-- Twitter: [@Uniswap](https://twitter.com/Uniswap)
-- Reddit: [/r/Uniswap](https://www.reddit.com/r/Uniswap/)
-- Email: [contact@uniswap.org](mailto:contact@uniswap.org)
-- Discord: [Uniswap](https://discord.gg/FCfyBSbCU5)
-- Whitepapers:
-  - [V1](https://hackmd.io/C-DvwDSfSxuh-Gd4WKE_ig)
-  - [V2](https://uniswap.org/whitepaper.pdf)
-  - [V3](https://uniswap.org/whitepaper-v3.pdf)
-
-## Accessing the Uniswap Interface
-
-To access the Uniswap Interface, use an IPFS gateway link from the
-[latest release](https://github.com/Uniswap/uniswap-interface/releases/latest),
-or visit [app.uniswap.org](https://app.uniswap.org).
+# Uniswap Labs Interface
 
-## Unsupported tokens
-
-Check out `useUnsupportedTokenList()` in [src/state/lists/hooks.ts](./src/state/lists/hooks.ts) for blocking tokens in your instance of the interface.
-
-You can block an entire list of tokens by passing in a tokenlist like [here](./src/constants/lists.ts) or you can block specific tokens by adding them to [unsupported.tokenlist.json](./src/constants/tokenLists/unsupported.tokenlist.json).
-
-## Contributions
+[![Unit Tests](https://github.com/Uniswap/interface/actions/workflows/unit-tests.yaml/badge.svg)](https://github.com/Uniswap/interface/actions/workflows/unit-tests.yaml)
+[![Integration Tests](https://github.com/Uniswap/interface/actions/workflows/integration-tests.yaml/badge.svg)](https://github.com/Uniswap/interface/actions/workflows/integration-tests.yaml)
+[![Lint](https://github.com/Uniswap/interface/actions/workflows/lint.yml/badge.svg)](https://github.com/Uniswap/interface/actions/workflows/lint.yml)
+[![Release](https://github.com/Uniswap/interface/actions/workflows/release.yaml/badge.svg)](https://github.com/Uniswap/interface/actions/workflows/release.yaml)
+[![Crowdin](https://badges.crowdin.net/uniswap-interface/localized.svg)](https://crowdin.com/project/uniswap-interface)
 
-For steps on local deployment, development, and code contribution, please see [CONTRIBUTING](./CONTRIBUTING.md).
+The web application hosted at https://app.uniswap.org is a convenient way to access the core functionality of the Uniswap Protocol. 
 
-## Accessing Uniswap V2
+For documentation of the interface including how to contribute or access prior builds, please view the README here: [INTERFACE_README.md](./INTERFACE_README.md)
 
-The Uniswap Interface supports swapping, adding liquidity, removing liquidity and migrating liquidity for Uniswap protocol V2.
+# Uniswap Labs Widgets
 
-- Swap on Uniswap V2: https://app.uniswap.org/#/swap?use=v2
-- View V2 liquidity: https://app.uniswap.org/#/pool/v2
-- Add V2 liquidity: https://app.uniswap.org/#/add/v2
-- Migrate V2 liquidity to V3: https://app.uniswap.org/#/migrate/v2
+The `@uniswap/widgets` package is an npm package of React components used to provide subsets of the Uniswap Protocol functionality in a small and configurable user interface element.
 
-## Accessing Uniswap V1
+The npm package can be found here. [@uniswap/widgets](https://www.npmjs.com/package/@uniswap/widgets)
 
-The Uniswap V1 interface for mainnet and testnets is accessible via IPFS gateways
-linked from the [v1.0.0 release](https://github.com/Uniswap/uniswap-interface/releases/tag/v1.0.0).
+For documentation of the widgets package, please view the README here: [WIDGETS_README.md](./WIDGETS_README.md).

WIDGETS_README.md

+# Uniswap Labs Swap Widget
+
+The Swap Widget bundles the whole swapping experience into a single React component that developers can easily embed in their app with one line of code. 
+
+![swap widget screenshot](https://raw.githubusercontent.com/Uniswap/interface/main/src/assets/images/widget-screenshot.png)
+
+You can customize the theme (colors, font, border radius, and more) to match the style of your application. You can also configure your own default token list and optionally set a convenience fee on swaps executed through the widget on your site.
+
+## Installation
+
+Install the widgets library via `npm` or `yarn`. If you do not already use the widget's peerDependencies `redux` and `react-redux`, then you'll need to add them as well. 
+
+```js
+yarn add @uniswap/widgets redux react-redux
+```
+```js
+npm i --save @uniswap/widgets redux react-redux
+```
+
+## Documentation
+
+- [overview](https://docs.uniswap.org/sdk/widgets/swap-widget)
+- [api reference](https://docs.uniswap.org/sdk/widgets/swap-widget/api)
+
+## Example Apps
+
+Uniswap Labs maintains two demo apps in branches of the [widgets-demo](https://github.com/Uniswap/widgets-demo) repo:
+
+- [NextJS](https://github.com/Uniswap/widgets-demo/tree/nextjs)
+- [Create React App](https://github.com/Uniswap/widgets-demo/tree/cra)
+
+Others have also also released the widget in production to their userbase:
+
+- [OpenSea](https://opensea.io/)
+- [Friends With Benefits](https://www.fwb.help/)
+- [Oasis](https://oasis.app/)
+
+## Legal notice
+
+Uniswap Labs encourages integrators to evaluate their own regulatory obligations when integrating this widget into their products, including, but not limited to, those related to economic or trade sanctions compliance.