chore: add renovate.json (#162)

As per the title.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,14 @@
+<!--  Thanks for sending a pull request! -->
+
+#### What this PR does / why we need it:
+
+#### Which issue(s) does this PR fixes?:
+
+<!--
+(Optional) Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
+-->
+
+Fixes #
+
+#### Additional comments?:

.github/renovate.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    "helpers:pinGitHubActionDigests",
+    ":semanticCommitTypeAll(bump)"
+  ],
+  "dependencyDashboard": true,
+  "dependencyDashboardAutoclose": false,
+  "major": {
+    "dependencyDashboardApproval": true
+  },
+  "rangeStrategy": "bump",
+  "packageRules": [
+    {
+      "matchPackagePatterns": ["eslint"],
+      "groupName": "eslint"
+    },
+    {
+      "matchPackagePatterns": ["jest"],
+      "groupName": "jest"
+    }
+  ]
+}