initial main menu and dependencies

Packages/packages-lock.json

@@ -1,5 +1,11 @@
 {
   "dependencies": {
+    "com.unity.2d.sprite": {
+      "version": "1.0.0",
+      "depth": 0,
+      "source": "builtin",
+      "dependencies": {}
+    },
     "com.unity.ai.navigation": {
       "version": "2.0.11",
       "depth": 0,