[GREEN] add boilerplate for client list admin

src/scenes/admin/ClientListAdmin/index.test.tsx

+import React from 'react';
+import { render } from 'utils/testing';
+import * as ROUTES from 'constants/routes';
+
+import ClientListAdmin from '.';
+
+describe('ClientListAdmin', () => {
+  it('renders correctly', () => {
+    render(<ClientListAdmin />, ROUTES.clientListForAdmin);
+  });
+});

src/scenes/admin/ClientListAdmin/index.tsx

+import React, { FC } from 'react';
+import { Text } from 'react-native';
+
+const ClientListAdmin: FC = () => <Text>hai</Text>;
+
+export default ClientListAdmin;