feat: add workflow to auto assign and add reviewers in the PRs

.github/auto_assign.yml

@@ -0,0 +1,13 @@
+# Set to true to add reviewers to pull requests.
+addReviewers: true
+
+# A number of reviewers added to the pull request
+# Set 0 to add all the reviewers (default: 0)
+numberOfReviewers: 0
+
+# A list of reviewers to be added to pull requests (GitHub user name).
+reviewers:
+  - sumanashrestha
+
+# Set addAssignees to 'author' to set the PR creator as the assignee.
+addAssignees: author

.github/workflows/auto-assign.yml

@@ -0,0 +1,15 @@
+# This workflow will add reviewers and assignee
+# on opened and ready_to_review pull requests.
+# 
+# This workflow uses .github/auto_assign.yml file as configuration.
+
+name: Auto assign reviewers
+on:
+  pull_request:
+    types: [opened, ready_for_review, reopened]
+
+jobs:
+  add-reviews:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: kentaro-m/[email protected]