chore: 添加action lgtm

.github/workflows/lgtm.yml

@@ -0,0 +1,15 @@
+name: Send LGTM reaction
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@1.0.0
+      - uses: micnncim/action-lgtm-reaction@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}