Add command line help

src/main.rs

@@ -11,6 +11,7 @@ const BASE_URL: &str = "https://api.azirevpn.com/v1";
 
 #[derive(Clap, Debug)]
 struct Opts {
+    /// Enables JSON output
     #[clap(short, long)]
     json: bool,
 
@@ -27,8 +28,13 @@ struct ConfigOpts {
 
 #[derive(Clap, Debug)]
 enum Command {
+    /// Prints the list of VPN endpoints
     Endpoints,
+
+    /// Prints WireGuard config
     Config(ConfigOpts),
+
+    /// Checks connection status
     Check,
 }