Feature Addition request- Add AppBar widget

[ShubhKanodia]

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Field	Description
About	🚀 Flutter's Widget Wonderland! Explore, Learn, Create. Your one-stop for all things Flutter widgets! 📱✨
Label	Add AppBar Widget

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Issue Title

Add AppBar Widget

Description

Overview

This issue is about adding an "AppBar" widget to the FlutterFolio widget catalog app. The "AppBar" widget is a common UI component in Flutter for displaying the app's title, leading actions, and actions.

Adhere to the below folder structure for reference

- lib/
  - screens/
    - home_screen.dart
    - widget_detail_screen.dart
  - models/
    - widget_models.dart
  - main.dart
  - assets/
  - images/
    - flutter_logo.png
  - data/
    - widgets_data.dart
  - theme
    - app_theme.dart
- README.md

Task

• Create a new widget for the "AppBar" in the lib/widgets folder.
• Implement the "AppBar" widget with the ability to customize its title, leading actions, and actions.
• Add the "AppBar" widget to the widget_data.dart data source with the widget's name, description, and image path.
• Update the home_screen.dart to dynamically generate an elevated button for the "AppBar" widget.

Acceptance Criteria

• The "AppBar" widget is created and can display a customizable title, leading actions, and actions.
• It is added to the widget catalog with a proper description and an image that represents the widget.
• Users can access information about the "AppBar" widget through the app's user interface.

Definition of Done

• The "AppBar" widget code is clean, well-documented, and follows Flutter best practices.
• The widget is tested and functions correctly.
• The widget is accessible through the app's user interface.
• The issue is reviewed and accepted.