Added Brook Docker Image

docker/brook/README.md

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+## Brook Docker Image by Teddysun
+
+[Brook][1] is a cross-platform proxy/VPN software which can help you get through firewalls.
+
+Docker images are built for quick deployment in various computing cloud providers.
+For more information on docker and containerization technologies, refer to [official document][2].
+
+## Prepare the host
+
+If you need to install docker by yourself, follow the [official installation guide][3].
+
+## Pull the image
+
+```bash
+$ docker pull teddysun/brook
+```
+
+This pulls the latest release of Brook.
+
+It can be found at [Docker Hub][4].
+
+## Start a container
+
+You **must set environment variable** `ARGS` at first.
+There is an example to start a container that listen on port `9000`, password is `password0` (both TCP and UDP) run as a brook server like below:
+
+```bash
+$ docker run -d -p 9000:9000 -p 9000:9000/udp --name brook --restart=always -e "ARGS=server -l :9000 -p password0" teddysun/brook
+```
+
+**Warning**: The port number must be same as environment variable and opened in firewall.
+
+[1]: https://github.com/txthinking/brook
+[2]: https://docs.docker.com/
+[3]: https://docs.docker.com/install/
+[4]: https://hub.docker.com/r/teddysun/brook/