update README

Signed-off-by: Jun Kimura <[email protected]>

Author: bluele

README.md

@@ -19,3 +19,9 @@ The design of LCP is based on the following principles:
 ## Documentation
 
 For the details, please see here: https://docs.lcp.network
+
+## Related repositories
+
+- https://github.com/datachainlab/lcp-go provides a Go implementation for LCP client and e2e tests between two tendermint chains using LCP
+- https://github.com/datachainlab/lcp-solidity provides a Solidity implementation for LCP client
+- https://github.com/datachainlab/cosmos-ethereum-ibc-lcp provies an IBC bridge demo between ethereum and tendermint chain