adds documentation

src/main.rs

@@ -9,5 +9,9 @@ mod server;
 fn main() {
     env_logger::init();
     dotenv::dotenv().ok();
+    // TODO: Build a cli app with complete support of DbApi
+    //       Server is started with 'serve' subcommand
+    //       $ lootalot serve
+    // Start the server.
     server::serve();
 }