Improve Readme

[ans-4175]

Add meaningful Readme for:

• Basic Motivation
• Algorithm Explanation
• Contributor Section and Contact

Erm, what else?

[imballinst]

Hmm, perhaps these?

1. Available features: list of currently implemented features (e.g. randomize password by letters/kata + pelafalan, copy to clipboard). A screenshot can also be useful.
2. Link to the app: since the link to the app is only available above and not if we scroll, perhaps we can also add the link to the app as well in the README.md?

3. Not sure, but does Vercel have this "deploy badge" or something? We can show the current deployed app status for fanciness purposes, I think.