Add Node.js project files

Author: Labby AI

index.js

@@ -0,0 +1,4 @@
+function sum(a, b) {
+  return a + b;
+}
+module.exports = sum;

index.test.js

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+const sum = require('./index');
+
+test('adds 1 + 2 to equal 3', () => {
+  expect(sum(1, 2)).toBe(3);
+});

package.json

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+{
+  "name": "ci-demo",
+  "version": "1.0.0",
+  "scripts": {
+    "test": "jest"
+  },
+  "dependencies": {
+    "jest": "^29.7.0"
+  }
+}