Add github workflow

Author: dolfbarr

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: Node.js ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm run lint
+      - run: npm run type:check
+      - run: npm run test