Platformer example started

Packages/manifest.json

@@ -8,9 +8,11 @@
     "com.unity.ai.navigation": "2.0.9",
     "com.unity.cinemachine": "3.1.5",
     "com.unity.collab-proxy": "2.11.2",
+    "com.unity.feature.2d": "2.0.2",
     "com.unity.ide.rider": "3.0.38",
     "com.unity.inputsystem": "1.17.0",
     "com.unity.multiplayer.center": "1.0.1",
+    "com.unity.nuget.newtonsoft-json": "3.2.2",
     "com.unity.render-pipelines.universal": "17.3.0",
     "com.unity.test-framework": "1.6.0",
     "com.unity.timeline": "1.8.10",