ci: adding simple workflow

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Setup node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+
+      - name: Install dependencies
+        run: |
+          npm ci
+
+      - name: Lint code
+        run: |
+          npm run lint
+
+      - name: Run tests
+        run: |
+          npm test