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):

light mode

dark mode

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

[Varun-Kolanu]

Thanks awesome work out there! Will open a new issue for color theme then. Maybe saikat was trying to implement that..

[may-tas]

Thanks. Yes , I think we can implement that too .