setup workflow

.github/workflows/main.yml

@@ -0,0 +1,23 @@
+name: default
+
+on: [push, pull_request]
+
+jobs:
+  build-and-test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Run tests
+      run: npm test