[FEATURE] Markdown file explaining how new Mava works

[mmorris44]

Feature

A clear and concise description of the feature to be implemented and why.

Proposal

A plan or brief overview of how the feature will be implemented.

Testing

A detailed description of how this feature will be tested.

• What are the core aspects of the feature that need testing?
• Outline the test cases and for each specify:
  • The purpose of the test.
  • The inputs.
  • The expected output.

Benchmarking (Optional)

Describe how and why this feature needs to be benchmarked with regards to:

• Performance in metric(s)...
• Speed
• Scale

Definition of done

A precise outline for the feature to be considered fully implemented, i.e. done/complete.

Mandatory checklist before making a PR

• [ ] The success criteria laid down in “Definition of done” are met.
• [ ] Code is documented - docstrings for methods and classes, static types for arguments.
• [ ] Code is tested - unit, integration and/or functional tests are added.
• [ ] Documentation is updated - README, CONTRIBUTING, or other documentation.
• [ ] All functional tests are green.
• [ ] Link experiment/benchmarking after implementation (optional).

Links / references / screenshots