Added hysteria Docker Image

docker/hysteria/README.md

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+## Hysteria Docker Image by Teddysun
+
+[Hysteria][1] is a feature-packed proxy & relay utility optimized for lossy, unstable connections, powered by a customized QUIC protocol.
+
+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/hysteria
+```
+
+This pulls the latest release of Hysteria.
+
+It can be found at [Docker Hub][4].
+
+## Start a container
+
+You **must create a configuration file**  `/etc/hysteria/server.json` in host at first:
+
+```
+$ mkdir -p /etc/hysteria
+```
+
+A sample in JSON like below:
+
+```
+{
+    "listen": ":8998",
+    "cert": "/etc/hysteria/cert.crt",
+    "key": "/root/hysteria/private.key",
+    "obfs": "dGVkZHlzdW4uY29tCg=="
+}
+```
+
+There is an example to start a container that listen on port `8998`, run as a Hysteria server like below:
+
+```bash
+$ docker run -d -p 8998:8998 --name hysteria --restart=always -v /etc/hysteria:/etc/hysteria teddysun/hysteria
+```
+
+**Warning**: The port number must be same as configuration and opened in firewall.
+
+[1]: https://github.com/HyNetwork/hysteria
+[2]: https://docs.docker.com/
+[3]: https://docs.docker.com/install/
+[4]: https://hub.docker.com/r/teddysun/hysteria/