[Android] Include permission in manifest automatically

[jamesmontemagno]

A nice pattern is if your plugin requires a permission you can add an assembly attribute:

https://github.com/jamesmontemagno/Xamarin.Plugins/blob/master/Media/Media/Media.Plugin.Android/Properties/AssemblyInfo.cs#L18-L19

[SimonSimCity]

Thanks for this information. Currently it depends on your implementation if you need the permission WRITE_EXTERNAL_STORAGE - that's why I chose to only note it down in the manual.

Even if it's the recommended way to write to a location outside your app (what requires the permission), you can download the file to a temporary directory by not providing any destination directory. This allows you to move it to an app-internal directory when the download has finished. Additional info is provided in #10

But I'll check if the permission is set when you try to start a download to a specified destination in #20.

[jamesmontemagno]

Ah gotcha, I didn't realize that it was optional :) Good to know.