added a new theme - green retro

[Gautam2305]

Hey there! I added a green colored theme in this project.

• It has a gif to give a messy room vibes.
• Worked on complementing colors in green shade.
• Added a linear gradient to the background.
• changes the font size of input form for better UX.

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[Gautam2305]

@Nainish-Rai i have added the theme, pls review it. Thanks in advance❤️

[Nainish-Rai]

@Gautam2305 Thanks for contributing, Theme looks good; MERGED!