feat(countdown): rocket countdown (#45)

src/widgets/clock.rs

@@ -207,10 +207,18 @@ impl<T> ClockState<T> {
         &self.mode
     }
 
+    pub fn run(&mut self) {
+        self.mode = Mode::Tick
+    }
+
     pub fn is_running(&self) -> bool {
         self.mode == Mode::Tick
     }
 
+    pub fn is_initial(&self) -> bool {
+        self.mode == Mode::Initial
+    }
+
     pub fn is_edit_mode(&self) -> bool {
         matches!(self.mode, Mode::Editable(_, _))
     }
@@ -294,6 +302,10 @@ impl<T> ClockState<T> {
         self.update_format();
     }
 
+    pub fn is_done(&self) -> bool {
+        self.mode == Mode::Done
+    }
+
     fn update_format(&mut self) {
         self.format = self.get_format();
     }