readme for Xamarin

Author: christiannagel

Xamarin/Readme.md

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+# Readme - Code Samples for Chapter 41, Xamarin.Forms
+
+> You can build and run part of the samples if you have a Windows 10 system or a Mac. To build and run all of the samples, you need a Windows 10 system and a Mac.
+
+The sample code for this chapter contains these projects and solutions:
+
+* HelloAndroid (a simple Xamarin.Android project)
+* HelloiOS (a simple Xamarin.iOS project for the iPhone)
+* BooksAppX (Xamarin.Forms)
+    * BooksAppX (shared project with views, container registrations, and services)
+    * BooksAppX.Android (hosting project for Android)
+    * BooksAppX.iOS (hosting project for iOS)
+    * BooksAppX.UWP (hosting project for UWP)
+    * BooksLib (library from the folder *PatternsXamarinShared*, view models and services)
+    * Framework (library from the folder *PatternsXamarinShared*, generic view models, MVVM core classes)
+
+Requirements:
+
+* For the Android and iOS projects, you can use Visual Studio for Mac and a Mac
+* For the UWP project, a Windows 10 system is required
+* To compile the iOS projects, a Mac is required - also if you use Visual Studio on Windows
+
+To build and run the samples with Visual Studio, please install:
+
+* Visual Studio 2017 Update 5 with the workload **Mobile Development with .NET**.
+
+ 
+For code comments and issues please check [Professional C#'s GitHub Repository](https://github.com/ProfessionalCSharp/ProfessionalCSharp7)
+
+Please check my blog [csharp.christiannagel.com](https://csharp.christiannagel.com "csharp.christiannagel.com") for additional information for topics covered in the book.
+
+Thank you!