docs: add Caddy install command to README

README.md

@@ -12,6 +12,12 @@ curl -fsSL https://git.vanusys.com/VanuSystems/shell-scripts/raw/branch/main/ins
 curl -fsSL https://git.vanusys.com/VanuSystems/shell-scripts/raw/branch/main/set-docker-mirror.sh | sudo bash
 ```
 
+> **Tip:** Install Caddy web server on Debian/Ubuntu/Raspbian.
+
+```bash
+curl -fsSL https://git.vanusys.com/VanuSystems/shell-scripts/raw/branch/main/install-caddy.sh | sudo bash
+```
+
 > **Tip:** Append 2-space indent settings to `~/.vimrc`.
 
 ```bash