Added Light and Dark Mode 👍

[shivamnarkar47]

:hammer_and_wrench: Fixes Issue

Closes https://github.com/Sanket1308/Weather-App/issues/29

:man_technologist: Changes proposed

Added function and localStorage variables to change to dark Mode. Added invert colors to be easily convert into dark mode or light mode. Added transition.Please review it. Thank you +1 !

:heavy_check_mark: Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

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