add readme

Author: nioncode

README.md

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+ArcProgressView
+===============
+Draws an arc shaped progress indicator with customizable colors and angles.
+As of now, the text shown in the preview is not drawn by the view, but inserted via a layout.
+
+The sample shows how to use the view and how easy it is to add simple animations to it.
+
+![Preview](/../screenshots/preview.png?raw=true "Preview")
+