FEAT: implemented app start and onboarding screens

[ara2105]

Addressed Issues:

Since this feature was implemented from scratch, I created the issue and opened this PR to track the implementation.

Fixes #30

Screenshots/Recordings:

App.start.and.onb.screens.recording.mp4

Additional Notes:

Started working directly from the fork since no issue was assigned.

How to Test

1. Clone the repository
2. Install dependencies
3. Run the project locally
4. Launch the app
5. On first launch, the onboarding screens should appear
6. Navigate through the onboarding screens using Next/Skip
7. After completion, the user should be redirected to the main screen

Expected Behavior

• App start screen loads when the app launches
• Onboarding appears only on the first launch
• Users can skip or complete onboarding

Checklist

• My PR addresses a single issue, fixes a single bug or makes a single improvement.
• My code follows the project's code style and conventions
• If applicable, I have made corresponding changes or additions to the documentation
• If applicable, I have made corresponding changes or additions to tests
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contribution Guidelines
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