Adding Documentation for Kvrocks Controller

[shubham-j-sde]

Presently, the documentation link redirects to Kvrocks Homepage Documentation,
Understanding how Kvrocks Controller is actually complete cluster solution with different installation procedure deserves proper documentation.

I would like to contribute on this part.

[alok-kumar0421]

Hi, I would like to work on this issue.

Before I start, could you please confirm:

1. Should the documentation be created as a separate page under the docs section?
2. Are there any existing internal documents or references that I should follow?

I can prepare a structured installation + usage guide for Kvrocks Controller.