add engine

main.rs

@@ -1,6 +1,12 @@
+mod engine;
 mod game;
+mod player;
 
 fn main() {
-    let b = game::Board::new();
-    let c = game::Cell::X;
+    let mut engine = engine::Engine::new();
+
+    match engine.run() {
+        Ok(_) => println!("game over"),
+        Err(e) => println!("{}", e),
+    };
 }