Add README

Author: bradwilson

README.md

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+# About This Project
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+This project contains a legacy PowerShell module used for building xUnit.net v2. There should be no contributions to this project.
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+# About xUnit.net
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+[<img align="right" width="100px" src="https://raw.githubusercontent.com/xunit/media/main/dotnet-foundation.svg" />](https://dotnetfoundation.org/projects/project-detail/xunit)
+
+xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C#, F#, VB.NET and other .NET languages. xUnit.net works with ReSharper, CodeRush, TestDriven.NET and Xamarin. It is part of the [.NET Foundation](https://www.dotnetfoundation.org/), and operates under their [code of conduct](https://www.dotnetfoundation.org/code-of-conduct). It is licensed under [Apache 2](https://opensource.org/licenses/Apache-2.0) (an OSI approved license).
+
+For project documentation, please visit the [xUnit.net project home](https://xunit.net/).