Add a reference to telegabber-docker

README.md

@@ -22,6 +22,10 @@ In the deploy directory, you need only three files:
 
 ### Installation ###
 
+A third-party Docker config was prepared to set up telegabber+Prosody: https://github.com/e1z0/telegabber-docker/
+
+**Hard way:**
+
 First of all, you need to create component listener on your Jabber server. 
 For example, for ejabberd in **/etc/ejabberd/ejabberd.yml**: