docs: update readme to add cmake

[thephez]

Issue being fixed or feature implemented

I found it necessary to install cmake (Ubuntu 22) which was not mentioned in the README.

What was done?

Added cmake to the list of essential build tools

How Has This Been Tested?

Building on Ubuntu 22.04

Breaking Changes

N/A

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone