add section for scoring workflow and visited booth

Why is this change being made?

Add details related to the Marketo scoring workflow that is triggered when a list is uploaded to Marketo for conference / field events.

There are many questions how & when these workflows are triggered so these details should help team members be more self-sufficient.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what