Hi there! This Wiki-page will give you the required information on how to use the library and also link some more help in case you are not very familiar with C/C++.
What is the library about?
To my knowledge, in C/C++, there is no adequate mathematics library included that allows matrix vector mathematics. Also, there seems to be no library offering things like LU decomposition, solving linear systems of equations, etc.
The library in this repository aims to provide exactly such a mathematics library such that scientific computing tasks can be handled more comfortably in C++.
What does it provide?
Generally most of what you will need. An extensive overview on what is provides in given in docs - which is not repeated in here.
What is not provided yet is numerical integration and derivation, solver with conditions, non-linear solvers, and differential equation solvers.
In page Help, some C++ stuff is explained. In case of CMake related questions, check the CMake Introduction page in this Wiki. For any other questions that may arise, please open an issue (in GitLab, menu bar in the left of the window).