Add .Net Core support (.Net Standard target)

[arkadiuszwojcik]

Would be nice to port this package to .Net Standard so it could be reusable across .Net Framework, .Net Core and Mono. I guess the main difficulty here is to deal with native libraries for so many platforms (do all .Net core targets have to be supported ?). Any thoughts on this ?

[migueldeicaza]

You correctly identified the problem.

We have talked about it, but have not officially requested the feature, I have now done so:

NuGet/Home#3114

Once that is done, we will add the missing support for these platforms across the board (not only SkiaSharp)

[mattleibow]

This is now available with .NET Standard 1.3 support and .NET Core support on osx, win7 and win10