add maintenance policy

README.md

@@ -1,3 +1,20 @@
+# About This Repository
+
+This repository was forked from https://github.com/tmc/grpc-websocket-proxy.
+tmc/grpc-websocket-proxy uses [gorilla/websocket](https://github.com/gorilla/websocket), and this library has been archived.
+Since tmc/grpc-websocket-proxy has not been updated for about a year and [the PR](https://github.com/tmc/grpc-websocket-proxy/pull/34) is ignored, we decided to fork it and maintain it ourselves.
+In this repository, tmc/grpc-websocket-proxy is replaced by [shiguredo/grpc-websocket-proxy](https://github.com/shiguredo/websocket) which has been maintained.
+
+## Maintain Policy
+
+* Maintain this module as long as we use this
+* If shiguredo/grpc-websocket-proxy was updated, then follow it
+* No modifications involving changes in specifications
+
+
+----------------------------------------------------------------
+
+
 # grpc-websocket-proxy
 
 [![GoDoc](https://godoc.org/github.com/tmc/grpc-websocket-proxy/wsproxy?status.svg)](http://godoc.org/github.com/tmc/grpc-websocket-proxy/wsproxy)