ex-1: introduce Manager subclass

Author: kaiosilveira

src/example-01/emplyees/manager/index.js

@@ -0,0 +1,11 @@
+import { Employee } from '..';
+
+export class Manager extends Employee {
+  constructor(name) {
+    super(name, `manager`);
+  }
+
+  get type() {
+    return `manager`;
+  }
+}

src/example-01/emplyees/manager/index.test.js

@@ -0,0 +1,8 @@
+import { Manager } from '.';
+
+describe('Manager', () => {
+  it('should have type "manager"', () => {
+    const engineer = new Manager('Kaio');
+    expect(engineer.type).toBe('manager');
+  });
+});