Add base classes and properties

Packages/manifest.json

@@ -8,6 +8,7 @@
     "com.unity.test-framework": "1.1.31",
     "com.unity.textmeshpro": "3.0.6",
     "com.unity.timeline": "1.6.4",
+    "com.unity.toolchain.win-x86_64-linux-x86_64": "2.0.0",
     "com.unity.ugui": "1.0.0",
     "com.unity.visualscripting": "1.7.6",
     "com.unity.modules.ai": "1.0.0",

Packages/packages-lock.json

@@ -85,6 +85,22 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.sysroot": {
+      "version": "2.0.0",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.sysroot.linux-x86_64": {
+      "version": "2.0.0",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "2.0.0"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.test-framework": {
       "version": "1.1.31",
       "depth": 0,
@@ -127,6 +143,16 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.toolchain.win-x86_64-linux-x86_64": {
+      "version": "2.0.0",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "2.0.0",
+        "com.unity.sysroot.linux-x86_64": "2.0.0"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ugui": {
       "version": "1.0.0",
       "depth": 0,