List implementations of spec in readme

Author: dom96

README.md

@@ -4,3 +4,8 @@ This is a proposal for an API for establishing TCP connections in Non-Browser Ja
 environments.
 
 To view the rendered document, visit https://sockets-api.proposal.wintercg.org/.
+
+### Implementations
+
+- Node.js - https://github.com/Ethan-Arrowood/socket
+- Cloudflare Workers - https://developers.cloudflare.com/workers/runtime-apis/tcp-sockets/