Update README.md

README.md

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-# System.Graphics
+# System.Graphics
+
+System.Graphics is a cross-platform graphics library for iOS, Android, Windows, macOS and Linux completely in C#.
+
+Platform               | Supported Abstractions |
+-----------------------|-------------------------------------------|
+Xamarin.iOS            |  CoreGraphics & SkiaSharp | 
+Xamarin.Android        | Android.Graphics & SkiaSharp |
+Xamarin.Mac            | CoreGraphics & SkiaSharp |
+WPF                    | SharpDX, SkiaSharp & GDI |
+WinForms               | SharpDX, SkiaSharp & GDI |
+Linux | SkiaSharp |
+Xamarin.Forms          | Dependent on native platform support (noted above) |
+
+Supported Abstractions
+* Drawing Canvas - You can draw to a any of the supported abstractions with a common drawing canvas API
+* Images - You can manage, load and create images with a common API
+* Fonts - You can access platform font information with a 
+* Attributed text - You can draw attributed text with a common API