Incorporate AiT Activity List

[ldodds]

The AiT Activity List has been shared with the the OpenActive CG under an open licence.

We should review the detail of this list and consider including it in the current draft. The list includes:

• around 300 terms
• organises activities into broader categories (top term) and types
• has a well-organised list of Yoga, Martial Arts, Individual and Team Sports (as the main top level categories)
• a set of top-level categories that could be used to inform discussion of #1.