chore(workflow): add cla.yml (#90)

.github/workflows/cla.yml

@@ -0,0 +1,27 @@
+name: "CLA Assistant"
+on:
+  issue_comment:
+    types: [ created ]
+  pull_request_target:
+    types: [ opened,closed,synchronize ]
+
+jobs:
+  CLAssistant:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "CLA Assistant"
+        if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
+        uses: contributor-assistant/github-action@v2.3.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # the below token should have repo scope and must be manually added by you in the repository's secret
+          PERSONAL_ACCESS_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+        with:
+          path-to-signatures: 'signatures/version1/cla.json'
+          path-to-document: 'https://github.com/OpenSPG/cla-assistant/blob/master/CLA.md' # e.g. a CLA or a DCO document
+          allowlist: test,bot*
+          remote-organization-name: OpenSPG
+          remote-repository-name: cla-assistant
+          lock-pullrequest-aftermerge: True
+
+