Introduce command-line flags to customize the timer's name and duration.
The `-name` flag sets the timer's label, and the `-duration` flag
accepts
a Go duration string (e.g., "25m", "1h"). This enhances flexibility for
users to configure their Pomodoro sessions directly from the command
line.
This commit introduces the initial implementation of a Pomodoro timer
terminal UI using Bubble Tea and Bubbles. The timer displays the task
name, total and elapsed time, and a progress bar. Users can quit the
application by pressing 'q'. The project dependencies are managed via
Go modules, and the build output is ignored in .gitignore.
