Added GitHub Actions Node.js CI Workflow

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build-node:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        node-version: [8.x, 10.x, 12.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Get npm cache directory
+        id: npm-cache
+        run: |
+          echo "::set-output name=dir::$(npm config get cache)"
+      - uses: actions/cache@v1
+        with:
+          path: ${{ steps.npm-cache.outputs.dir }}
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - name: npm install, build, and test
+        run: |
+          npm ci
+          npm run build --if-present
+        env:
+          CI: true