Add a `CMakeLists.txt`

CMake is a very powerful tool used for creating makefiles that allow compiling the project in different platforms. Therefore, it would be useful to add it to the project.

The issue names only a new CMakeLists.txt and does not identify existing build files, entry points, or tests. Start by inspecting the repository structure and current compilation instructions; done means the project can be configured and built through CMake on the intended platforms.

Written by the indexing model from the issue text.