Added Rider package

Packages/manifest.json

@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "com.unity.ide.rider": "3.0.31",
     "com.unity.ide.visualstudio": "2.0.22",
     "com.unity.textmeshpro": "3.0.6",
     "com.unity.ugui": "1.0.0",

Packages/packages-lock.json

@@ -2,11 +2,20 @@
   "dependencies": {
     "com.unity.ext.nunit": {
       "version": "1.0.6",
-      "depth": 2,
+      "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.ide.rider": {
+      "version": "3.0.31",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.ext.nunit": "1.0.6"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ide.visualstudio": {
       "version": "2.0.22",
       "depth": 0,