Add the mocks in the bundle to use it in the installing app.

[ankit-agrawal11]

Originally reported by: Shishir Anshuman (Bitbucket: shishiranshuman13, GitHub: shishiranshuman13)

---

The mocks such as localStorage, fileMocks are being used in all the react projects while testing.

The task is to:

• Export these file from react-hero in order to be used in all of our projects for testing.
• Add a section in the README.md explaining how to use these mocks.

---

• Bitbucket: https://bitbucket.org/causecode/react-hero/issue/23