Updated README

README.md

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 # Xamarin.Forms CosmoDB Demo
+
+Application to take notes made with Xamarin.Forms using .NET Standard and **CosmosDB**.
+
+![](notes-cosmosdb.png)
+
+The app targets two platforms:
+
+- iOS
+- Android
+
+## Requirements
+
+- Visual Studio 2015 (14.0 or higher) to compile C# 6 language features (or Visual Studio MacOS)
+- Xamarin add-ons for Visual Studio (available via the Visual Studio installer)
+- Visual Studio Community Edition is fully supported!
+- Android SDK Tools 25.2.3 or higher
+- JDK 8.0
+
+
+## Copyright and license
+
+Code released under the MIT license.