Added README

README.md

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+# Xamarin.Forms Performance Playground
+
+There are many techniques for increasing the **performance** of Xamarin.Forms applications. Collectively these techniques can greatly reduce the amount of work being performed by a CPU, and the amount of memory consumed by an application. This repository describes and discusses these techniques.
+
+_(Work in progress)_
+
+* Bindings
+* CollectionView
+* Fast Renderers
+* HttpClient
+* Images
+* IoC
+* Layouts
+* Shell
+* Views
+* Visual
+* XAMLC
+
+### XAMLC
+
+![XAMLC](images/xamlcperf.png)
+
+### HttpClient
+
+![HttpClient](images/httpclientperf.png)
+
+## Copyright and license
+
+Code released under the [MIT license](https://opensource.org/licenses/MIT).