Productive mind

A productive mind can push and pop tasks into it's stack efficiently

Push tasks into the mind stack (or continue with an existing task)

```bash mind

Enter the names for the tasks to push.

Press [ENTER] again to save the added tasks.

```

Pop the current task from the mind stack

bash mind pop

I'll keep adding features (small or big) and keep improving the code quality while I learn more cool ways to be productive and become better developer.