add docker-compose.yml for gogs

gogs/README.md

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+gogs
+====
+
+[Gogs][1] (Go Git Service) is a painless self-hosted Git service.
+
+## docker-compose.yml
+
+```yaml
+gogs:
+  image: gogs/gogs
+  ports:
+    - "22:22"
+    - "80:3000"
+  volumes:
+    - ./data:/data
+  restart: always
+```
+
+> :warning: Listening on port 22 and 80 may cause problems!
+
+## up and running
+
+```
+$ docker-compose up -d
+```
+
+[1]: https://gogs.io/

gogs/docker-compose.yml

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+gogs:
+  image: gogs/gogs
+  ports:
+    - "22:22"
+    - "80:3000"
+  volumes:
+    - ./data:/data
+  restart: always