Merge pull request #3 from dotnet-presentations/intro-xamarin-deck

Add Intro to Xamarin deck

Author: jongalloway

Introduction to Mobile Development with Xamarin/Introduction to Mobile Development with Xamarin.pptx

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+# Introduction to Mobile Development with Xamarin
+
+Complete walkthrough of mobile development with Xamarin. This includes how Xamarin integrates into the .NET ecosystem to build iOS, Android, macOS, tvOS, and watchOS apps with .NET and Visual Studio. This goes through all of the essential pieces to development with Xamarin including:
+
+* Sharing .NET Code
+* Native API Access & Xamarin.Essentials
+* Native UI & Xamarin.Forms UI
+* Tooling & Libraries
+* Azure Integration
+* Visual Studio Support
+
+## Setup
+
+* [Install Visual Studio tools for Xamarin](https://docs.microsoft.com/visualstudio/cross-platform/setup-and-install)
+* [App Code](https://github.com/jamesmontemagno/VS2019-FirstXamarinApp)
+
+## Demo Walkthrough
+
+* Videos are embed into the power point (via YouTube). Feel free to reach out to James Montemagno at motz@microsoft.com for video download.