add contributes workflow, resolve #55

.github/workflows/contributors.yml

@@ -0,0 +1,21 @@
+name: Contributors
+on:
+  schedule:
+    - cron: '0 1 * * 0' # At 01:00 on Sunday.
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+    inputs:
+      logLevel:
+        description: 'manual run'
+        required: false
+        default: ''
+jobs:
+  contributors:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: bubkoo/contributors-list@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          round: true