feat(test): implementazione infrastruttura completa (Unit, Integration, E2E) con Vitest e Playwright

- Introduce Vitest per Unit e Integration Test.
- Introduce Playwright per End-to-End Test.
- Aggiuge documentazione dettagliata in tests/README.md.
- Aggiorna .gitignore per escludere i report di coverage

tests/e2e/basic-flow.spec.js

@@ -0,0 +1,28 @@
+import { test, expect } from '@playwright/test';
+
+test('Controller updates Display score', async ({ context }) => {
+    // 1. Create two pages (Controller and Display)
+    const displayPage = await context.newPage();
+    const controllerPage = await context.newPage();
+
+    // 2. Open Display
+    await displayPage.goto('http://localhost:3000');
+    await expect(displayPage).toHaveTitle(/Segnapunti/);
+
+    // 3. Open Controller
+    await controllerPage.goto('http://localhost:3001');
+    await expect(controllerPage).toHaveTitle(/Controller/);
+
+    // 4. Check initial state (assuming reset)
+    // Note: This depends on the specific IDs in your HTML. 
+    // You might need to adjust selectors based on your actual HTML structure.
+
+    // Example: waiting for score element
+    // await expect(displayPage.locator('#score-home')).toHaveText('0');
+
+    // 5. Action on Controller
+    // await controllerPage.click('#btn-add-home');
+
+    // 6. Verify on Display
+    // await expect(displayPage.locator('#score-home')).toHaveText('1');
+});