pub fn progress_bar<'a, Theme>(
    range: RangeInclusive<f32>,
    value: f32,
) -> ProgressBar<'a, Theme>where
    Theme: Catalog + 'a,Expand description
Creates a new ProgressBar.
Progress bars visualize the progression of an extended computer operation, such as a download, file transfer, or installation.
It expects:
- an inclusive range of possible values, and
 - the current value of the 
ProgressBar. 
ยงExample
use iced::widget::progress_bar;
struct State {
   progress: f32,
}
enum Message {
    // ...
}
fn view(state: &State) -> Element<'_, Message> {
    progress_bar(0.0..=100.0, state.progress).into()
}