Add workflow

.github/workflows/create-on-pull-request.yml

@@ -0,0 +1,33 @@
+name: Create Comment
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  createComment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      # For debugging purposes. Remove this in production.
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+
+      - name: Create comment
+        uses: ./
+        id: couc
+        with:
+          issue-number: ${{ github.event.number }}
+          body: |
+            This is a multi-line test comment
+            - With GitHub **Markdown**
+            - Created by [create-or-update-comment][1]
+
+            [1]: https://github.com/peter-evans/create-or-update-comment
+          reaction-type: '+1'
+
+      - name: Check outputs
+        run: |
+          echo "Comment ID - ${{ steps.couc.outputs.comment-id }}"