Added Caddy v1.0.5 Docker Image

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

docker/caddy/Caddyfile

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+# The Caddyfile is an easy way to configure your Caddy web server.
+#
+# Unless the file starts with a global options block, the first
+# uncommented line is always the address of your site.
+#
+# To use your own domain name (with automatic HTTPS), first make
+# sure your domain's A/AAAA DNS records are properly pointed to
+# this machine's public IP, then replace the line below with your
+# domain name.
+:80
+
+# Set this path to your site's directory.
+root * /usr/share/caddy
+
+# Enable the static file server.
+file_server
+
+# Another common task is to set up a reverse proxy:
+# reverse_proxy localhost:8080
+
+# Or serve a PHP site through php-fpm:
+# php_fastcgi localhost:9000
+
+# Refer to the Caddy docs for more information:
+# https://caddyserver.com/docs/caddyfile