automate the contributors list in readme file

[coding-geek21]

As we see 14 people contributed but all the contributors are not displayed in readme,
We can add built in code to update it automatically
I would like to work on this issue please assign me under lgmsoc-2021

[github-actions]

Hey @coding-geek21 welcome to the repo, good to see you created your first issue here!

[akshitadixit]

Hey @coding-geek21 I get your point, but I purposely left it out for participants to gain points by making an extra PR.