2.1 and 2.2 release notes

Added .NET UWP 2.1 and 2.2 release notes

releases/UWP/net-native2.1/README.md

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+# .NET native tools 2.1 (UWP 6.1.x) Release Notes
+
+You can see what was included in each .NET Native 2.1 ([Microsoft.NETCore.UniversalWindowsPlatform 6.1.x](https://www.nuget.org/packages/Microsoft.NETCore.UniversalWindowsPlatform)) release below.
+
+When using Visual Studio these packages require Visual Studio 2017 Version 15.7 or later.
+
+### UWP 6.1.2 (.NET native tools 2.1.3) (May 7th, 2018)
+- Adds support for [Optional packages with executable code](https://docs.microsoft.com/en-us/windows/uwp/packaging/optional-packages-with-executable-code)
+- Fixes multiple errors caused by low memory issues when compiling .NET native apps [521825, 574099, 574102]
+- Fixes Binding issues when using ReactiveUI [406415 and 406417]
+- Fixes VS new project scenarios to include the correct Runtime Directives [464683]
+- Fixes an issue handling unicode characters in .NET native targets [482808]
+- Adds support for the Diagnostics.DisableMetadataStackTraceResolution AppContextSwitch [519008]
+- Fixes crashes during compilation [525417]
+- Fixes issue found when compiling complex generic types like those found in NPGSQL NuGet package [588948]
+- Fixes an issue when using System.Runtime.InteropServices.SafeHandle as an argument in native to managed scenarios [601979]

releases/UWP/net-native2.2/README.md

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+# .NET native tools 2.2 (UWP 6.2.x) Release Notes
+
+You can see what was included in each .NET Native 2.2 ([Microsoft.NETCore.UniversalWindowsPlatform 6.2.x](https://www.nuget.org/packages/Microsoft.NETCore.UniversalWindowsPlatform)) release below.
+
+When using Visual Studio these packages require Visual Studio 2017 Version 15.7 or later.
+
+### UWP 6.2 Preview (May 7th, 2018) 
+These are preview bits in advance of the release at the end of 2018
+- Adds support for ARM64