initial main menu and dependencies

Packages/manifest.json

@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "com.unity.2d.sprite": "1.0.0",
     "com.unity.ai.navigation": "2.0.11",
     "com.unity.ide.rider": "3.0.39",
     "com.unity.ide.visualstudio": "2.0.27",