feat(edit): 10x up/down (#110)

* feat(edit): 10x up/down

* fix `MAX_DURATION` (decisecond)

* footer: add `edit 10x` keybindings

* README: update keybindings

src/widgets/countdown.rs

@@ -194,9 +194,15 @@ impl TuiEventHandler for CountdownState {
                 KeyCode::Left => {
                     self.clock.edit_next();
                 }
+                KeyCode::Up if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                    self.clock.edit_jump_up();
+                }
                 KeyCode::Up => {
                     self.clock.edit_up();
                 }
+                KeyCode::Down if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                    self.clock.edit_jump_down();
+                }
                 KeyCode::Down => {
                     self.clock.edit_down();
                 }