[Android] Automatically request permission

[James Montemagno]

You could follow the practice I have done here:
https://github.com/jamesmontemagno/Xamarin.Plugins/blob/master/Media/Media/Media.Plugin.Android/MediaImplementation.cs#L147-L163

Or simply link people to my permissions plugin to handle and request the permission before attempting to start a download.

[Simon Schick]

I named it in the manual, so the programmers can decide how to handle it.

[James Montemagno]

Perfect :) thanks

[Lars Werner]

Link changed to: https://github.com/jamesmontemagno/MediaPlugin/blob/master/src/Media.Plugin.Android/MediaImplementation.cs

Check out RequestStoragePermission() function