Update api.js

update readme + permissions

Create LICENSE

update readme

spotify has changed its dom structure so only detect ads by web title for now

update url to get access token from spotify

fix failed to get token

fix no active device when fetch player success

add a helper about ads mute feature on Web player

#3 reduce cover art size by choosing appropirate one

we don't need lodash anymore

reduce background production size by load redux-logger only on dev mode

#7 - add searching indicator, remove load more button when there's no more result to load

#6 add loading indicator when changing playing song

#5 fix volume bar input default value is not updated when player is re-rendered