feat: add nethermind verkle example file (#379)

examples/verkle-gen-nethermind.yaml

+participants:
+  - el_client_type: geth
+    el_client_image: ethpandaops/geth:gballet-kaustinen-with-shapella-fc8f4b9
+    cl_client_type: lighthouse
+    cl_client_image: ethpandaops/lighthouse:verkle-trees-capella-2ffb8a9
+    count: 2
+  - el_client_type: nethermind
+    el_client_image: nethermindeth/nethermind:kaustinen
+    cl_client_type: lodestar
+    cl_client_image: ethpandaops/lodestar:g11tech-verge-815364b
+    validator_count: 0
+  - el_client_type: nethermind
+    el_client_image: nethermindeth/nethermind:kaustinen
+    cl_client_type: lodestar
+    cl_client_image: ethpandaops/lodestar:g11tech-verge-815364b
+    validator_count: 0
+network_params:
+  electra_fork_epoch: 0
+  seconds_per_slot: 3
+additional_services:
+  - el_forkmon
+  - tx_spammer
+  - dora
+  - prometheus_grafana
+snooper_enabled: true
+ethereum_metrics_exporter_enabled: true