add a README

README.md

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+# Proxying IP over HTTP 
+
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/quic-go/connect-ip-go)](https://pkg.go.dev/github.com/quic-go/connect-ip-go)
+[![Code Coverage](https://img.shields.io/codecov/c/github/quic-go/connect-ip-go/master.svg?style=flat-square)](https://codecov.io/gh/quic-go/connect-ip-go/)
+
+connect-ip-go is a partial implementation of the CONNECT-IP protocol [RFC 9484](https://datatracker.ietf.org/doc/html/rfc9484), based on [quic-go](https://github.com/quic-go/quic-go). It provides both a client and a proxy implementation.
+
+
+## Release Policy
+
+connect-ip-go always aims to support the latest two Go releases.
+
+## Contributing
+
+We are always happy to welcome new contributors! If you have any questions, please feel free to reach out by opening an issue or leaving a comment.