Chore: add gh workflow

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: Node.js CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        node: [12.x, 14.x, 16.x]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+    - run: npm install
+    - run: npm test
+    - name: Coveralls Parallel
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.github_token }}
+        flag-name: run-${{ matrix.test_number }}
+        parallel: true
+  finish:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true
+