Beginner Issue [GSSOC20] : Add contributors names to the README

[ucalyptus]

• Check out the Closed PR list and see which ones were merged.
• According to easy, medium and hard or beginner , sort them out
• Mention their github id , their PR or PRs beside them.
• Add them to the README.
• Only add contributors whose PRs have [gssoc20] labels.

[chttrjeankr]

Would like to take this up. :slightly_smiling_face:

[ucalyptus]

send a pr

[Amitsharma45]

@ucalyptus i would like to work on this issue please assigm this issue to me

[ucalyptus]

Send a pr. I would say this to all people who are interested.