Link API reference from top of readme

Author: cifkao

README.md

@@ -4,7 +4,9 @@
 [![Published on webcomponents.org](https://img.shields.io/badge/webcomponents.org-published-blue.svg)](https://www.webcomponents.org/element/html-midi-player) 
 [![jsDelivr](https://data.jsdelivr.com/v1/package/npm/html-midi-player/badge?style=rounded)](https://www.jsdelivr.com/package/npm/html-midi-player)
 
-`<midi-player>` and `<midi-visualizer>` HTML elements powered by [@magenta/music](https://github.com/magenta/magenta-js/tree/master/music/) (Magenta.js), fully stylable and scriptable.
+[`<midi-player>`](https://github.com/cifkao/html-midi-player/blob/master/doc/midi-player.md#midi-player)
+and [`<midi-visualizer>`](https://github.com/cifkao/html-midi-player/blob/master/doc/midi-visualizer.md#midi-visualizer)
+HTML elements powered by [@magenta/music](https://github.com/magenta/magenta-js/tree/master/music/) (Magenta.js), fully stylable and scriptable.
 
 See a demo [here](https://codepen.io/cifkao/pen/WNwpLzL).