[Proposal] Add H5P activity to MTG

[izendegi]

Hi,

Having recently added core activities in the Moodle Tool Guide is something I'd like to see.

Specifically I think that adding H5P activity to the guide could be a good improvement, not sure about others (LTI external tool, SCORM, BigBlueButton) because they can be configured and used in many different ways for many different purposes.