To add a project on water potability detection

[Vaishnavi-M-1909]

I made a project on water potability which will help beginners to understand more of the ML Algorithms such as logistic regression, XGBoost, and so on. I want to add it in my contribution for SWoC

[github-actions]

Thanks for creating the issue,Please read the Pinned issued first and Readme.md in each Pull Request you made. Keep learning...

[Vaibhav2154]

@Vaishnavi-M-1909 Make sure you add the project with proper documentation in a structured way.