Add LGTM Action

.github/workflows/lgtm.yml

@@ -0,0 +1,25 @@
+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@0.5.4
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          GITHUB_ISSUE_NUMBER: ${{ github.event.issue.number }}
+          GITHUB_COMMENT_BODY: ${{ github.event.comment.body }}
+          GITHUB_COMMENT_ID: ${{ github.event.comment.id }}
+          GITHUB_PULL_REQUEST_NUMBER: ${{ github.event.pull_request.number }}
+          GITHUB_REVIEW_BODY: ${{ github.event.review.body }}
+          GITHUB_REVIEW_ID: ${{ github.event.review.id }}
+        with:
+          trigger: '^(lgtm|LGTM)!?$'
+          override: true
+          source: lgtmapp