Update README.md

Author: CoderJava

README.md

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 ## Flutter UI Challenge: Music Player
 Resource Design: [https://dribbble.com](https://dribbble.com/)<br />
 [![Music Player](https://cdn.dribbble.com/users/551602/screenshots/6010742/musicplayer_-_dribbble_2x.png)](https://dribbble.com/shots/6010742-Music-player)
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+Output App<br />
+![UI List Songs](https://github.com/CoderJava/Flutter-UI-Challenge-Music-Player/blob/master/screenshots/UI%20List%20Songs.png)