Fix selection sort.py

[diptangsu]

Add a proper function and add the sorting code in the function.

User if __name__ == '__main__': and write a few lines of code with a simple example.

[UbadahJ]

I would like to take this issue

[UbadahJ]

Most of the python files in repo don't have type annotations, should I add them or go without them?

[diptangsu]

@UbadahJ Adding type annotations would be amazing!

[UbadahJ]

Adding annotations to current python file. Should I create a issue to add annotations to every python file?

[diptangsu]

@UbadahJ I thought I would take care of it haha. But I'm not getting much time to go through the code. If you want you can add an issue, if someone else does it for me, who am I to stop them? 😆

[UbadahJ]

I have added a new issue for that, just assign that to me