adding light mode toggle

[Amitkumarkoli]

Description

adding light and dark theme across screens with a icon button

Fixes #3

Type of Change

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• 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 not work as expected)
• This change requires a documentation update
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• [ √] My code follows the style guidelines of this project
• [√ ] I have performed a self-review of my own code
• [ √] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

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[Bijayanee]

Hey @Amitkumarkoli, some changes are required in your code.
Appbars need to be of same purple color that is used for other icons and buttons;
color of the texts, hint texts, text boxes in home page should also be changed with the theme;
remove the theme toggle button from home page, it will only be there in profile edit page.

[Amitkumarkoli]

ok I'll do asap.