Made note for later

templates/Guacamole/0/README.md

@@ -10,4 +10,7 @@ On the "mysql" container, run:
 
 ## Post-Installation
 
-Make sure you create your own user account and delete the "guacadmin" user (or at very least change the password)
+Make sure you create your own user account and delete the "guacadmin" user (or at very least change the password)
+
+## TODO
+* Allow adding extensions