Feat : Added AppBar

[may-tas]

Description

added an app bar, it has a hamburger icon on the left to open the navigation bar, a datePicker in the centre and a theme change Button at the end, you can use it to switch from light to dark mode.

Related Issue

Fixes #6

Type of Change

• [ ] Bug fix
• [x] New feature
• [ ] Documentation update

Screenshots (if any):

lightMode

darkMode

Checklist

• [x] My code follows the style guidelines of this project
• [x] 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
• [x] My changes generate no new warnings

[may-tas]

I have added a theme file for both light and dark with colours and font sizes for buttons, text, and other constants. Everyone can use theme colours and formatting to have a uniform app look.

[Varun-Kolanu]

@may-tas Good looking noicee Can you decrease the number of commits and also resolve the conflicts..

And also, it would be good if some more color themes are added with light and dark... Maybe experiment more 2-3 color themes like bluish, greenish, yellowish etc? Or I have a crazy idea that user can upload some photo of a color and according to that, we can make shades out of it and apply it all over the app? 🤡 Do message here when ready to review

[may-tas]

i have opened another pull request , see that. Yeah that's a nice idea , what I'm thinking is that we can use different shades in light and dark.