Update README.md

README.md

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 <a href="https://hub.docker.com/r/cloverzrg/frps-docker/tags?page=1&ordering=last_updated"><img src="https://img.shields.io/github/v/tag/cloverzrg/frps-docker?label=version&style=flat-square" alt="Latest Version"></a>
   <a href="https://hub.docker.com/r/cloverzrg/frps-docker/"><img src="https://img.shields.io/docker/stars/cloverzrg/frps-docker.svg?style=flat-square&logo=docker" alt="Docker Stars"></a>
   <a href="https://hub.docker.com/r/cloverzrg/frps-docker/"><img src="https://img.shields.io/docker/pulls/cloverzrg/frps-docker.svg?style=flat-square&logo=docker" alt="Docker Pulls"></a>
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+ ## Build Status: 
   [![Build Status](https://drone.jeongen.com/api/badges/cloverzrg/frps-docker/status.svg)](https://drone.jeongen.com/cloverzrg/frps-docker)
 
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+## Dockerfile. 
+https://github.com/cloverzrg/frps-docker
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 ## USAGE
 #### 1. use host network
 `docker run -d --name frp-server --net=host -v /var/docker/frps/conf/frps.ini:/conf/frps.ini --restart=always cloverzrg/frps-docker`