Move TUI logic to a new tui.go file, separating concerns and improving
maintainability. Integrate terminal-notifier to display a notification
when the timer completes on Darwin systems. Update README to include
terminal-notifier as a requirement.
- Updated dependencies in go.mod and go.sum to latest versions.
- Added README.md with usage instructions and requirements.
- Added justfile with build, run, and dev tasks.
- Updated .gitignore to exclude tmp/ directory.
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.
