copied renovate.json to main branch to enable renovate controller

renovate.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "automerge": false,
+  "platformAutomerge": false,
+  "schedule": [
+    "every month"
+  ],
+  "packageRules": [
+    {
+      "matchUpdateTypes": [
+        "minor",
+        "patch"
+      ],
+      "groupName": "all non-major dependencies",
+      "groupSlug": "all-minor-patch",
+      "matchPackageNames": [
+        "*"
+      ]
+    }
+  ],
+  "enabledManagers": [ "bundler" ]
+}