Added Caddy v1.0.5 Docker Image

Signed-off-by: Teddysun <i@teddysun.com>

docker/caddy/README.md

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+## Caddy Docker Image by Teddysun
+
+[Caddy][1] is a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go.
+
+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/caddy
+```
+
+This pulls the version **v1.0.5** of Caddy.
+
+It can be found at [Docker Hub][4].
+
+## Start a container
+
+You **must create a configuration file**  `/etc/caddy/Caddyfile` in host at first:
+
+```
+$ mkdir -p /etc/caddy
+```
+
+A sample `Caddyfile` please visit [here](https://github.com/caddyserver/dist/blob/master/config/Caddyfile)
+
+Caddy requires write access to two locations: a [data directory](https://caddyserver.com/docs/conventions#data-directory), and a [configuration directory](https://caddyserver.com/docs/conventions#configuration-directory). 
+
+There is an example to override the default `Caddyfile`, you can mount a new one at `/etc/caddy/Caddyfile` like below:
+
+```bash
+$ docker run -d -p 80:80 --name caddy --restart=always -v /etc/caddy:/etc/caddy teddysun/caddy
+```
+
+[1]: https://caddyserver.com/
+[2]: https://docs.docker.com/
+[3]: https://docs.docker.com/install/
+[4]: https://hub.docker.com/r/teddysun/caddy/