Add github-actions-workflow: PR reviewer reminder (#439)

Signed-off-by: Taras Drozdovskyi <[email protected]>

.github/workflows/pull-request-reviewer-reminder.yml

@@ -0,0 +1,15 @@
+name: 'PR reviewer reminder'
+on:
+  schedule:
+    # Check reviews every weekday, 10:00 and 17:00
+    - cron: '0 10,17 * * 1-5'
+
+jobs:
+  pull-request-reviewer-reminder: 
+    runs-on: ubuntu-latest
+    steps:
+      - uses: tommykw/pull-request-reviewer-reminder-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }} # Required
+          reminder_message: 'One business day has passed since the review started. Give priority to reviews as much as possible. 🙏' # Required. Messages to send to reviewers on Github.
+          review_turnaround_hours: 24 # Required. This is the deadline for reviews. If this time is exceeded, a reminder wil be send.