Creating login screen and adding some styles to the onboarding page

[marcellintacite]

Adding Login page and adding some styles on the onboarding page

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Description

This pull request introduces design enhancements to the onBoarding screen and Login screen in our Expo project. It includes improvements in layout, styling, and user experience, such as updated color schemes, better alignment, and improved responsiveness.

Motivation and Context

The motivation behind these changes is to create a more visually appealing and user-friendly onboarding and login experience for our app users. The existing screens lacked a cohesive design, and these improvements address that issue.

How Has This Been Tested?

I have thoroughly tested these changes on Android simulators and on real devices. The following steps were taken during testing:

• Verified that the screens render correctly without any layout issues.
• Checked that the color schemes and styling changes are consistent across different devices and screen sizes.
• Tested user interactions, such as swiping through onboarding slides and entering login credentials.
• Ensured that the screens work well in both portrait and landscape orientations.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.