add docs links and usage to docker-compose.yml

docker-compose.yml

@@ -1,3 +1,13 @@
+# This docker-compose config for ArchiveBox runs the following containers:
+#     - ArchiveBox (it creates the initial archive, then sleeps forever to allow commands to be run with exec to add links)
+#     - nginx webserver running on https://127.0.0.1:8098
+# Usage:
+#     docker-compose up -d
+#     echo "https://example.com" | docker-compose exec -T archivebox /bin/archive
+#     docker-compose exec archivebox /bin/archive https://example.com/some/feed.rss
+# Documentation:
+#     https://github.com/pirate/ArchiveBox/wiki/Docker#docker-compose
+
 version: '3'
 
 services:
@@ -5,6 +15,7 @@ services:
         build: .
         stdin_open: true
         tty: true
+        # env_file: path/to/your/ArchiveBox.conf
         environment:
             - USE_COLOR=False
             - SHOW_PROGRESS=False