docs: notes on new xgov

Author: romanagureev

new_xgov.md

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+## Requirements
+- [Broadcaster](https://github.com/curvefi/curve-xgov/blob/feat/taiko/contracts/Broadcaster.vy) on Ethereum that forwards messages from DAO to bridge.
+- [Relayer](https://github.com/curvefi/curve-xgov/blob/feat/taiko/contracts/Relayer.vy) on your network that checks the sender and relays messages to agents(mirrors of Curve DAO entities).
+It should be safe from blocking the contracts and any external access to execution.
+
+## Examples
+There is a version in vyper 0.4.0 with module imports, but there are issues with running tests: https://github.com/curvefi/curve-xgov/tree/feat/taiko/contracts/taiko
+
+Vyper 0.3.10 version example: https://github.com/curvefi/curve-xgov/tree/master/contracts