Simpliest way to compare two files from the project from the solution explorer
See the change log for changes and road map.
Select two files in solution explorer and right click..
Then select "compare files..." to see the diff view
Check out the contribution guidelines if you want to contribute to this project.
For cloning and building this project yourself, make sure to install the Extensibility Tools 2015 extension for Visual Studio which enables some features used by this project.