Chore: add README.md, add LICENSE inside clog.h

Wrote the README and added a copy of the license inside clog.h

Feat(clog): add CLOG_DEBUG support and versioning

- Added versioning information inside clog.h

- Introduced CLOG_DEBUG flag

- Moved get_level() under CLOG_DEBUG

- Added compile-time error if debug functions are used without CLOG_DEBUG

Feat(init_clog): created a macro

Created a macro to have optional parameters for the init_clog

Feat(clog): created the structure for the logger