Updating the Prim Ref page

[Vincent Messenet]

IMHO a Wiki sounds good for this type of documentation and especially with the collaborative approach this project deserve.

Additionally a shared Google Sheet could be useful to prepare the work, split the charge in tasks, assign tasks over multiple people and track the progress.

The approach could be to:

1. List all prims to be documented and distribute them per category of prims
   
2. Define a template for the Wiki
   
3. Define the first category of prims to tackle and fill in the Wiki page using the template
   
4. If necessary iterate with 2 and 3 until we are satisfied
   
5. Then we can either continue similarly in workgroup category per category until we have addressed all categories
   OREach person participating choose and take care of a category until we have addressed all categories