Update README.md:--add-host host.docker.internal=host-gateway fixes #1156 (#1250)

README.md

@@ -136,6 +136,7 @@ docker run \
     -v $WORKSPACE_DIR:/opt/workspace_base \
     -v /var/run/docker.sock:/var/run/docker.sock \
     -p 3000:3000 \
+    --add-host host.docker.internal=host-gateway \
     ghcr.io/opendevin/opendevin:0.3.1
 ```
 You'll find opendevin running at `http://localhost:3000`.