added comments to dockerfiles

evennia/game_template/Dockerfile

@@ -1 +1,5 @@
 FROM evennia/evennia:latest
+# MAINTAINER you@example.com
+
+# this is all we need. 
+# the ONBUILD directive in the evennia/evenia image does most of the work for us.

evennia/game_template/docker-compose.yml

@@ -1,8 +1,10 @@
 version: '2'
 
 services:
+  # optionally change service id 'mygame' below to match your game (no spaces)
   mygame:
     build: .
+    # change 'myuser/mygame' below to a valid docker hub repository tag
     image: myuser/mygame
     stdin_open: true
     tty: true