Update README.md

Adding official docker repo.

README.md

@@ -23,6 +23,7 @@
 - Linux Script
   - [XTLS/Xray-install](https://github.com/XTLS/Xray-install)
 - Docker
+  - Official: [ghcr.io/xtls/xray-core](https://ghcr.io/xtls/xray-core) 
   - [iamybj/docker-xray](https://hub.docker.com/r/iamybj/docker-xray)
   - [teddysun/xray](https://hub.docker.com/r/teddysun/xray)
 - Web Panel