Add readme to v2m0

Author: gianbelinche

core/node/da_clients/README.md

@@ -10,4 +10,5 @@ Currently, the following DataAvailability clients are implemented:
 - `Avail` that sends the pubdata to the Avail DA layer.
 - `Celestia` that sends the pubdata to the Celestia DA layer.
 - `EigenV1M0` that sends the pubdata to the Eigen V1M0 DA layer.
+- `EigenV2M0` that sends the pubdata to the Eigen V2M0 DA layer.
 - `EigenV2M1` that sends the pubdata to the Eigen V2M1 DA layer.