give detailed support for implementing cookiebot Consent

Problem/Motivation

Ensuring that the MAtomo module respects users' choice about cookies should be explicitly documented.

Steps to reproduce

the MAtomo docs clearly delineates how to proceed, but using the module one does not know where to put the extra js snippets

Proposed resolution

Provide explicit instructions about this in the readme.md

Remaining tasks

User interface changes

API changes

Data model changes