Add container doc (#344)

container/README.md

@@ -0,0 +1,15 @@
+# Libra-node container image
+
+Run the container with a volume mount at `/root/.libra`, for example like this to deploy a full node:
+
+```shell
+$ cd some-handy-place
+$ mkdir libra-home
+$ export libra_container_tag=ghcr.io/0lnetworkcommunity/libra-framework/libra-node:latest
+$ docker run -it --volume $(pwd)/libra-home:/root/.libra ${libra_container_tag} libra-config fullnode-init
+downloaded genesis block
+config created at /root/.libra/fullnode.yaml
+fullnode configs initialized  ·································· ✓
+$ docker run -it -d --volume $(pwd)/libra-home:/root/.libra -p 9101:9101 -p 6182:6182 -p 8080:8080 ${libra_container_tag} libra node
+```
+The node's API service is now available on port 8080 and monitoring on port 9101.