Documentation improvement

[cyber5tar86]

I think it would be necessary to start thinking about structuring the documentation the same way as JSON for Modern C++ project documentation is managed

[UnixY2K]

Hi I think that would be a good idea in order to improve adoption for SQLiteCpp, maybe this should be done on some smaller Issues/PRs like:

• readme cleanup, and moving additional documentation to a docs directory
• make a script in order to generate the proper documentation(and choose which system to use)
• document properly the files which are not documented

after that

• make a CI for the selected documentation generator
• add sections for the library usage so we have something to show

and maybe as an additional step, add a translated version of the documentation(or just the readme)