Add Caddy web server reverse proxy documentation (#286)

docs/caddy.md

@@ -0,0 +1,14 @@
+# Caddy reverse proxy
+
+This is a very basic config, assuming that you're using Caddy to manage SSL certificates for you.
+Any log is disabled by default. Do not forget to replace `server_name` with your domain.
+
+```
+https://<server_name> {
+  reverse_proxy localhost:3000
+
+  log {
+      output discard
+  }
+}
+```

docs/index.md

@@ -15,6 +15,7 @@
 - [Configuration](./configuration.md)
 - [Apache2 Virtual Host with Reverse Proxy](./apache2.md)
 - [Nginx Reverse Proxy Configuration](./nginx.md)
+- [Caddy Reverse Proxy Configuration](./caddy.md)
 - [Database Information and Maintenance](./db-maintenance.md)
 - [Issues with CAPTCHA](./captcha-bug.md)
 - [How to setup Anti-Captcha](./anti-captcha.md)