caddy: add page (#6115)

pages/common/caddy.md

@@ -0,0 +1,28 @@
+# caddy
+
+> A powerful, enterprise-ready, open source web server with automatic HTTPS, written in Go.
+> More information: <https://caddyserver.com>.
+
+- Start Caddy in the foreground:
+
+`caddy run`
+
+- Start Caddy with the specified Caddyfile:
+
+`caddy run --config {{path/to/Caddyfile}}`
+
+- Start Caddy in the background:
+
+`caddy start`
+
+- Stop a background Caddy process:
+
+`caddy stop`
+
+- Run a simple file server on the specified port with a browsable interface:
+
+`caddy file-server --listen :{{8000}} --browse`
+
+- Run a reverse proxy server:
+
+`caddy reverse-proxy --from :{{80}} --to localhost:{{8000}}`