Updated Changelog and Readme for WinUI3 release

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Win2D Changelog
 
+## Win2D-WinUI 0.5.0 - Project Reunion 0.5.0 support
+_March 31, 2021_
+
+This change moves Win2D onto Project Reunion 0.5.
+ - Moving Win2D onto WinUI3 is work in progress, and some features that were available on Win2D-WinUI2 are not supported on Win2D-WinUI3, such as CanvasAnimatedControl and CanvasBitmap
+ - The home of the Win2D samples is now the Win2D-Sample Gallery on github (not yet updated for Project Reunion): https://github.com/Microsoft/Win2D-Samples
+
+---
+
 ## Win2D 1.25.0 - XAML Islands support
 _April 2, 2020_
 

README.md

@@ -8,7 +8,7 @@ Moving Win2D over to ProjectReunion and WinUI3 is a work in progress, and some f
 
 Win2D is an easy-to-use Windows Runtime API for immediate mode 2D graphics
 rendering with GPU acceleration. It is available to C#, C++ and VB developers
-writing apps for the Windows Universal Platform (UWP). It utilizes the power
+writing apps for WinUI3. It utilizes the power
 of Direct2D, and integrates seamlessly with XAML and CoreWindow.
 
 ##### Where to get it