Document exposed functions

[TomAFrench]

Problem

ACVM simulator is a user facing package so we need to ensure that it's easy to use for developers which are new to the Noir JS ecosystem.

Proposed solution

Each function should be properly documented with information on how it should be used.

As an example see #13

Alternatives considered

No response

Additional context

This work should ideally be done in conjunction with #enforce

Submission Checklist

• Once I hit submit, I will assign this issue to the Project Board with the appropriate tags.