add docker-compose v2

docker/contrib/docker-compose/README.md

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+# Docker Compose
+
+[Gogs](https://github.com/gogits/gogs) : Go Git Service
+
+Docker Compose v2 (Docker 1.10) with mysql as database
+
+Place docker-compose.yaml in  `~/docker-compose/gogs/docker-compose.yaml` for exemple:
+
+In the `gogs` folder, bring up the stack :
+
+```
+# docker-compose up -d
+Creating network "gogs_default" with the default driver
+Creating volume "gogs_gogs_db_data" with local driver
+Creating volume "gogs_gogs_server_data" with local driver
+Creating gogs_db
+Creating gogs_server
+```
+
+Check containers :
+
+```
+# docker-compose ps
+   Name                  Command               State                       Ports
+----------------------------------------------------------------------------------------------------
+gogs_db       /entrypoint.sh mysqld            Up      3306/tcp
+gogs_server   docker/start.sh /bin/s6-sv ...   Up      0.0.0.0:10022->22/tcp, 0.0.0.0:3000->3000/tcp
+```
+
+Access Gogs URL to finalize installation : `http://localhost:3000`
+
+To destroy the stack (`-v` option deletes volumes) :
+
+```
+# docker-compose down -v
+Stopping gogs_server ... done
+Stopping gogs_db ... done
+Removing gogs_server ... done
+Removing gogs_db ... done
+Removing network gogs_default
+Removing volume gogs_gogs_db_data
+Removing volume gogs_gogs_server_data
+```

docker/contrib/docker-compose/docker-compose.yaml

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+version: '2'
+services:
+    gogs_server:
+        image: gogs/gogs
+        container_name: gogs_server
+        ports:
+            - "3000:3000"
+            - "10022:22"
+        links:
+            - gogs_db:mysql
+        volumes:
+            - gogs_server_data:/data
+    gogs_db:
+        image: mysql
+        container_name: gogs_db
+        volumes:
+            - gogs_db_data:/var/lib/mysql
+        environment:
+            - MYSQL_ROOT_PASSWORD=password
+            - MYSQL_DATABASE=gogs
+volumes:
+  gogs_server_data:
+    driver: local
+  gogs_db_data:
+    driver: local