adding multiplayer

Packages/manifest.json

@@ -15,11 +15,14 @@
     "com.unity.ide.visualstudio": "2.0.22",
     "com.unity.inputsystem": "1.13.0",
     "com.unity.multiplayer.center": "1.0.0",
+    "com.unity.multiplayer.playmode": "1.3.3",
+    "com.unity.netcode.gameobjects": "2.4.3",
     "com.unity.probuilder": "6.0.5",
     "com.unity.recorder": "5.1.2",
     "com.unity.render-pipelines.universal": "17.0.4",
     "com.unity.test-framework": "1.4.6",
     "com.unity.timeline": "1.8.7",
+    "com.unity.transport": "2.5.1",
     "com.unity.ugui": "2.0.0",
     "com.unity.visualscripting": "1.9.5",
     "com.unity.modules.accessibility": "1.0.0",