Add Caddy example that's easier to setup than nginx.

Using-WireGuard-Easy-with-Caddy-SSL.md

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+This is an example on how to use WireGuard Easy with [Caddy](https://caddyserver.com), to access it on an HTTPS domain (e.g. `https://wg-easy.myhomelab.com`).
+
+## `docker-compose.yml`:
+
+```yaml
+version: "3.8"
+
+services:
+  wg-easy:
+    environment:
+      # ⚠️ Change the server's hostname (clients will connect to):
+      - WG_HOST=wg-easy.myhomelab.com
+
+      # ⚠️ Change the Web UI Password:
+      - PASSWORD=foobar123
+    image: weejewel/wg-easy
+    container_name: wg-easy
+    hostname: wg-easy
+    volumes:
+      - ~/.wg-easy:/etc/wireguard
+    ports:
+      - "51820:51820/udp"
+    restart: unless-stopped
+    cap_add:
+      - NET_ADMIN
+      - SYS_MODULE
+    sysctls:
+      - net.ipv4.ip_forward=1
+      - net.ipv4.conf.all.src_valid_mark=1
+
+  caddy:
+    image: caddy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"
+    volumes:
+      - $PWD/Caddyfile:/etc/caddy/Caddyfile
+      - caddy_data:/data
+      - caddy_config:/config
+
+volumes:
+  caddy_data:
+  caddy_config:
+```
+
+## `Caddyfile` (Same location as docker-compose.yml):
+
+```
+⚠️wg-easy.myhomelab.com {
+  reverse_proxy wg-easy:51821
+}
+```
+
+Save these files, edit the variables marked with `⚠️` and run `docker-compose up -d` in the same directory.
+Caddy takes care of certificate generation and renewal automatically.
+
+Of course, make sure to point `wg-easy.myhomelab.com` to your server's IP address with a DNS A record or DynamicDNS or any other method. Ensure ports `80`, `443`, `51820` are available (e.g. by forwarding them in your router).
+
+That's it!