Added a README.md

Author: jaredpar

src/XUnitConverter/README.md

@@ -0,0 +1,18 @@
+# XUnitConverter
+
+This is a tool for converting projects from using MSTest to XUnit.  This tool automates many of the repetitive tasks like changing to `[Fact]` attributes, using the correct methods on `Assert`, updating namespaces, etc ...  
+
+## Usage
+The tool takes only the project to be converted as an argument. 
+
+``` 
+xunitconverter <project path>
+```
+
+## Contributing
+
+We follow the same contribution process that 
+[corefx is using][corefx-contributing].
+
+[corefx-contributing]: https://github.com/dotnet/corefx/wiki/Contributing
+