Added galaxy instruction

Author: blackandred

README.md

@@ -3,6 +3,10 @@ SSH Fallback Port
 
 Allows to define a fallback SSH port, in case our playbook is for example reconfiguring the SSH server.
 
+```bash
+ansible-galaxy install blackandred.server_ssh_fallback_port
+```
+
 Example usage:
 ```yamlex
 - hosts: all