Add GitHub Actions CI Workflow

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: Node.js CI
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Install dependencies
+      run: npm ci
+    - name: Lint
+      run: npm run lint
+    - name: Test
+      run: npm run test -- --coverage --verbose --ci
+    - name: Build
+      run: npm run build
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1