Add CI

.github/workflows/ci.yaml

@@ -0,0 +1,18 @@
+# Default workflow for NPM / Node with tests
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v3
+      - run: npm ci
+      - run: npm run build
+      - run: npm test