Add examples

examples/yearbook/person.test.js

@@ -0,0 +1,9 @@
+import { describe, expect, it } from 'vitest';
+import { Person } from './person';
+
+describe('Person', () => {
+  it('should be an instance of a Person', () => {
+    const person = new Person('John', 'Doe', '2000-01-01');
+    expect(person).toBeInstanceOf(Person);
+  });
+});