[Docs] Rename Docker README to README.md, so github recognizes that it as a Markdown file and update the git url in it

docker/README.md

@@ -0,0 +1,37 @@
+# Docker Setup
+These are the official Docker files for master branch and the current release packages.
+
+## Volumes
+These containers are setup so that you can mount your freeswitch configuration form a host or data volume container.
+
+To mount freeswitch Configuration
+```
+-v $(pwd)/configuration:/etc/freeswitch
+```
+
+To mount tmp directory for storing recordings, etc
+```
+-v $(pwd)/tmp:/tmp
+```
+
+The container also has a healthcheck where it does a fs_cli status check to make sure the freeswitch service is still running.
+
+# Ports
+
+The container exposes the following ports:
+
+- 5060/tcp 5060/udp 5080/tcp 5080/udp as SIP Signaling ports.
+- 5066/tcp 7443/tcp as WebSocket Signaling ports.
+- 8021/tcp as Event Socket port.
+- 64535-65535/udp as media ports.
+- 16384-32768/udp
+
+
+
+
+If you wish to help improve these please submit a pull request at:
+
+https://github.com/signalwire/freeswitch
+
+Thanks,
+/b