Implement playItem with skipToTrackIndex

[hspinks]

In the Spotify iOS SDK v1.0.2 release, Spotify added a new method to SPTAppRemotePlayerAPI to play a playlist from a given index:

-(void)playItem:(id<SPTAppRemoteContentItem>)contentItem skipToTrackIndex:(NSInteger) index callback:(nullable SPTAppRemoteCallback)callback

I'm happy to help contribute this functionality to the package! Let me know if there are any specific guidelines I should follow in contributing, or generally if you have any advice for developing a native module for React Native, as I'm fairly new to that.

Really nice work with this package in general, this has been super helpful and easy to work with

[cjam]

Hey sorry for the huge delay, I've been traveling around the world for the past 4 months and am getting back into this repo.

My plan is to first get this repo working with CocoaPods and update to the latest SDK. At that point, I will likely be trying to incorporate the new changes.

I will keep you posted with contribution help. I have to get myself back into this repo and remember where this repo is at for.

[cjam]

This is now in release v0.1.0