ci: Add GH Action for auto issue reply

Author: Cubik65536

.github/workflow/label-commenter.yml

@@ -0,0 +1,18 @@
+name: Label Commenter
+
+on:
+  issues:
+    types:
+      - labeled
+      - unlabeled
+      
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Label Commenter
+        uses: peaceiris/actions-label-commenter@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          config_file: .github/configs/label-commenter-config.yml