Accessibility features to be added

[kshorenicholas]

People with visual impairments may not be able to use the app with ease. We should add features that accommodate for them according to the flutter manual here --> https://docs.flutter.dev/development/accessibility-and-localization/accessibility.

TL;DR features to be implemented:

• accommodation for large font sizes,
• color contrasts,
• screen readers.

[kshorenicholas]

This blog explains some of this --> https://medium.com/flutter-community/a-deep-dive-into-flutters-accessibility-widgets-eb0ef9455bc