Improve documentation and naming

[ChaoticRoman]

No description provided.

[github-actions]

Based on the code change provided, it appears to be a renaming of files and directories, as well as some additions to the project structure.

Here are my feedback and suggestions:

1. Renaming files and directories: The renaming of the workflow file from learn-github-actions.yml to build-and-test.yml seems appropriate if it reflects the purpose of the workflow. However, it would be helpful to have more context on why the renaming was done.

2. Project structure changes: The addition of CMakeLists.txt and Makefile files, as well as the tests directory, indicates a shift towards using CMake for building the project and adding unit tests. This is a good improvement as CMake provides better flexibility and maintainability for building projects.

3. TODO list: The TODO list at the end of the code change indicates future improvements to be made. It's good to have a clear plan for further development, including hierarchical CMake files, testing, linting, and using external dependencies.

Overall, the code change seems to be a step in the right direction for improving the project structure and build process. It would be helpful to have more information on the reasoning behind the changes and any specific issues or goals being addressed.