Based on the idea of: https://github.com/ttscoff/doing/blob/master/README.md#usage
- start @tag1 @tag2 <- Start new task, restart if paused, stop latest task if started
- tag : tag last/current task
- note : add note to last/current task
- pause : [1h|10m]
- finish : finish latest/current task
- show : show current task information
- list : list all taks
- recent : list recent 3 tasks
- today : list today tasks
- yesterday : list yesterday tasks
- grep : list task matching text, tag or pattern
- export : Export list as pdf (not implemented yet)
- add : [today|tomorrow|] <time[3h|15m]> <- will add fixed task at date/time (not implemented yet)