chore: adding commitlint

.github/workflows/commitlint.yml

@@ -0,0 +1,14 @@
+name: commitlint
+on: [pull_request]
+jobs:
+  lint-commits:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.1
+        with:
+          # we actually need "github.event.pull_request.commits + 1" commit
+          fetch-depth: 0
+      - uses: actions/setup-node@v2.1.0
+      # or just "yarn" if you depend on "@commitlint/cli" already
+      - run: yarn add @commitlint/cli
+      - run: yarn run commitlint --from HEAD~${{ github.event.pull_request.commits }} --to HEAD