Update README and add some python programs

[swapnanildutta]

Update the README about python and how to execute the programs

And add some python programs for any domain.

[ankurjain00]

Hi @swapnanildutta, would like to contribute with python program created a pull request for Bubble Sort and Matrix Multiplication

[varchasa]

Hi @swapnanildutta, what kind of python programs we can create or we can select program from any domain.

[mayankgoyal-13]

Improved and added new features in temperature #12

[swapnanildutta]

You may add python codes from any domain, but not basic ones. It can be Flask, Django, or any other domain.

[mayankgoyal-13]

i have added temperature.py #12 and it has been merged but not labeled as hacktoberfest-accepted.

[swapnanildutta]

If it is merged, it is accepted for Hacktoberfest. @pixel-tech

[seongkyu-lim]

I have added palindrome_num.py #21 , for first thing.

and I wonder motive of making this repository. thank you