title: how to show Progress Bar for delivery updation in flutter
body: <p>i wanna add a progress bar in my app but i dont know how to do this thing. i just a beginer for flutter and wanna learn how to add progress bar i<a href="https://i.stack.imgur.com/vdmo6.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/vdmo6.gif" alt="enter image description here"></a>n delivery Application</p>