[Add] Unity MCP

Packages/manifest.json

@@ -6,6 +6,7 @@
     "com.unity.ide.visualstudio": "2.0.26",
     "com.unity.inputsystem": "1.18.0",
     "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",

Packages/packages-lock.json

@@ -103,6 +103,13 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.nuget.newtonsoft-json": {
+      "version": "3.2.2",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
     "com.unity.render-pipelines.core": {
       "version": "17.3.0",
       "depth": 1,