Updated Readme

[aryav-v]

Readme looks even better now :)

Changes proposed along with screenshots

Added banner to readme.

Added bullet points to contributing guidelines section

[AvineshTripathi]

I think https://github.com/kubesimplify/website/pull/127 is better and we don't require a banner. Thoughts?

[shivam-sharma7]

I think #127 is better and we don't require a banner. Thoughts?

• Yes #127 is better, we don't need it actually right now.