Update readme.md with feature in table

[ananyag309]

I just saw that in main readme file big images of gssoc and hactoberfest is present it will look more organised if we implement something like this

if need please assign this issue to me

[github-actions[bot]]

👋 Thank you for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!

[jinx-vi-0]

@ananyag309 You can work on this, but I won't add any levels to it.

[ananyag309]

ok but atlease add my name in assignes and open source label

[lakshmirajvagu]

@jinx-vi-0 I would like to work on it