Add imports to docs examples

Currently docs feature examples like this:

const MyComponent = () => (
  <Button raised onPress={() => console.log('Pressed')}>
    Press me
  </Button>
);

What I find not great for DX here is the lack of import statement, which clearly states how to import the module.

This looks much better and removes the ambiguity of how to import specific component:

import { Button } from 'react-native-paper';

const MyComponent = () => (
  <Button raised onPress={() => console.log('Pressed')}>
    Press me
  </Button>
);

[thymikee]

Do it 😃

[satya164]

If we are adding imports, let’s add everything that’s needed to copy/paste and run the example