ABORT implementation successful via double fork demon

- the developed solution matches the classic double fork method to produce daemon processes.
- concept standardization established. Good to go.
- Note - The current implementation is only inside `RETR` command.
- Next steps - Extend it to other commands using same method.

v0.2

- Added a list of supported commands in readme
- cleaned up the todolist
- logs for v0.2 attached
- v0.2 released with changelog

Project done.