Added CI

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4.1.1
+    - name: Use Node 20.x
+      uses: actions/setup-node@v4.0.1
+      with:
+        node-version: 20.x
+        cache: npm
+    - run: npm ci
+    - run: npm test