SignUpScreen named SignInScreen

[Aastha]

The component defined in SignUpScreen.js is called SignInScreen. This creates an issue while running import SignUpScreen from './SignUpScreen' in RootStackScreen.js.
To fix this, rename the component like so:

\\ ./screens/SignUpScreen.js

const SignUpScreen = ({navigation}) => {
    const [data, setData] = React.useState({
       ...
      </View>
    );
};