Added Sample app for SliverAppBar Widget

[TheGuyDangerous]

What does this implement/fix? Explain your changes Added a sample app/folder for showcasing SliverAppBar Widget.

Does this close any currently open issues?

• [ ] Yes
• [x ] No

Any relevant logs, error output, bug-report etc?

Any other comments?

• Where has this been tested? Android Emulator and Android 12 physical device

• Target Platform: Android/IOS

• Configuration Information:

• Misc:

[nisrulz]

You want to add an entry in the Readme file.

Also compress the demo gif file.

[TheGuyDangerous]

Hi @nisrulz , thanks a lot for the code review! I've updated the code according to the changes requested.

[nisrulz]

Just one comment and this should be good to merge once that is resolved.

[TheGuyDangerous]

Hi , eagerly waiting for you to merge the Pr :). It's been a long time since you reacted to my comment.