add mutiplier player plugin

Packages/manifest.json

@@ -11,6 +11,7 @@
     "com.unity.ide.visualstudio": "2.0.23",
     "com.unity.inputsystem": "1.14.2",
     "com.unity.multiplayer.center": "1.0.0",
+    "com.unity.multiplayer.playmode": "1.6.1",
     "com.unity.render-pipelines.universal": "17.0.4",
     "com.unity.test-framework": "1.5.1",
     "com.unity.timeline": "1.8.9",

Packages/packages-lock.json

@@ -134,6 +134,15 @@
         "com.unity.modules.uielements": "1.0.0"
       }
     },
+    "com.unity.multiplayer.playmode": {
+      "version": "1.6.1",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.nuget.newtonsoft-json": "2.0.2"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.nuget.mono-cecil": {
       "version": "1.11.4",
       "depth": 3,
@@ -141,6 +150,13 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.nuget.newtonsoft-json": {
+      "version": "3.2.1",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
     "com.unity.profiling.core": {
       "version": "1.0.2",
       "depth": 1,