Add CLI argument documentation

src/lib.rs

@@ -19,15 +19,19 @@ pub struct AppSettings {
     #[command(flatten)]
     source: Source,
 
+    /// The port the app should listen for connections on
     #[arg(short, long, default_value = "25565")]
     port: u16,
 }
 
+/// The source for the world configuration, either an existing world from a peer, a specific seed, or none (which implies a random seed)
 #[derive(Args)]
 #[group(required = false, multiple = false)]
 struct Source {
+    /// Passing the same seed will always generate the same world
     #[arg(short, long)]
     seed: Option<Seed>,
+    /// <ip>:<port> to a peer's world
     #[arg(short, long)]
     connect: Option<SocketAddr>,
 }