See the change log for changes and road map.
The reason for using this extension is to ensure that all type names in the C# editor are the same color. The default behavior of Visual Studio is to render C# types in blue, and framework & custom types in a blue-green color.
IMHO: they should all be the same color, makes reading the code easier.
Replaces C# language type names with .NET Framework type names. For example string to String, int to Int32, bool to Boolean, et al.
For cloning and building this project yourself, make sure to install the Extensibility Tools 2019 extension for Visual Studio which enables some features used by this project.