update README to add branches info (#273)

README.md

@@ -37,5 +37,9 @@ git submodule update --init
 
 Follow the [contribution guidelines](CONTRIBUTING.md) to contribute to eigensdk-go
 
+## Branches
+
+For consistency with [eigenlayer-middleware](https://github.com/Layr-Labs/eigenlayer-middleware) and [eigenlayer-contracts](https://github.com/Layr-Labs/eigenlayer-contracts) repos, we no longer use the master branch and instead use dev as the default branch, which will track as closely as possible the dev branch of eigenlayer-middleware (which in turn tracks the dev branch of eigenlayer-contracts). This convention will also be followed for other important branches. For eg, the m2-mainnet branch of this repo will track the m2-mainnet branch of eigenlayer-middleware (which tracks the unfortunately named mainnet branch of eigenlayer-contracts), and same with the testnet-holesky branch.
+
 ## Security Bugs
 Please report security vulnerabilities to [email protected]. Do NOT report security bugs via Github Issues.