[doc] add a demo to deploy and train adapter

[yezhengmao1]

1. we can manually trigger the ci to publish the mlora_cli tool, see: /root/mLoRA/.github/workflows/publish-mlora-cli.yml
2. we can manually trigger the ci to publish the image, see: /root/mLoRA/.github/workflows/publish-image.yaml

Now deploying mlora with docker is easy, just a few commands. I build all dependencies in the image (so it's huge, > 8GB).

When deploying our mlora service as a backend server, we can use a simple client tool (mlora_cli) to connect to it, and submit or terminal some tasks.

For detailed usage, see README.md I updated.

[yezhengmao1]