GitHub Download the source code how to use?

$ git clone https://github.com/gabyx/ApproxMVBB.git

URLs can be obtained by GitHub up to clone or download

Keep it in the same directory as your command line.
so you're going to use the CD command to go to the directory you want to save and then Git clone

First of all: see README.MD, many projects have, there is no explanation.
Second: See what code you download, corresponding to the corresponding development environment.
then: Compile in the corresponding development environment (the scripting language is placed directly in the application). If the class library needs to be placed in a specific instance, it can be run directly if it is an instance.