DOC: Installation Instruction Not Available in Readme.md

[aditya-gupta24005]

What's wrong with the existing documentation

No installation guide given or requirement.txt given

Add ScreenShots

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[Kartikey44]

Hi, I’d like to work on adding proper installation and setup instructions
to the README.md. Please assign this issue to me.

[Kartikey44]

Thanks for the update!
Since a PR is already linked to this issue, I’ll step back to avoid duplicate work.
Happy to help with review or testing if needed.

[rahulharpal1603]

https://github.com/AOSSIE-Org/PictoPy?tab=contributing-ov-file

Contributing file already contains the installation instructions.