meta: versioning doc

specs/meta/versioning.md

+# Versioning
+
+## Go modules
+
+Go modules that are currently versioned:
+```
+*bedrock modules versioning work in progress
+```
+
+Go modules which are not yet versioned:
+```
+	./batch-submitter  (changesets)
+	./bss-core
+	./gas-oracle       (changesets)
+	./indexer          (changesets)
+	./l2geth           (changesets)
+	./l2geth-exporter  (changesets)
+	./op-batcher
+	./op-bindings
+	./op-e2e
+	./op-exporter      (changesets)
+	./op-node
+	./op-proposer
+	./proxyd           (changesets)
+	./teleportr        (changesets)
+	./state-surgery
+```
+
+### versioning process
+
+Since changesets versioning is not compatible with Go we are moving away from it.
+Starting with new bedrock modules, Go-compatible tags will be used,
+formatted as `modulename/vX.Y.Z` where `vX.Y.Z` is semver.
+
+## Typescript
+
+See Changesets.