Add Docker Volume from 1.9

docker/README.md

@@ -44,6 +44,15 @@ docker run --name=gogs-data --entrypoint /bin/true gogs/gogs
 # Use `docker run` for the first time.
 docker run --name=gogs --volumes-from gogs-data -p 10022:22 -p 10080:3000 gogs/gogs
 ```
+#### Using Docker 1.9 Volume command
+
+```
+# Create docker volume.
+$ docker volume create --name gogs-data
+
+# Use `docker run` for the first time.
+$ docker run --name=gogs -p 10022:22 -p 10080:3000 -v gogs-data:/data gogs/gogs
+```
 
 ## Settings