Added a readme for the changelogs

changelogs/README.md

@@ -0,0 +1,9 @@
+# Changelogs
+
+In this directory, there are is set of sub-folders for each NuGet package - each containing a set of API diffs for each release.
+
+ * **[SkiaSharp](SkiaSharp/README.md)**
+ * **[SkiaSharp.Views](SkiaSharp.Views/README.md)**
+ * **[SkiaSharp.Views.Forms](SkiaSharp.Views.Forms/README.md)**
+ * **[SkiaSharp.HarfBuzz](SkiaSharp.HarfBuzz/README.md)**
+ * **[HarfBuzzSharp](HarfBuzzSharp/README.md)**