cubicweb-faq #2965314 basic FAQ setup [validation pending]

A FAQ consists of Questions and Answers organized in Categories.

prioritynormal
typeenhancement
done in0.1.0
load0.500
load left0.000
closed by#39bf42ba6d74 Add schema and entities (closes #2965314)
patchAdd schema and entities (closes #2965314) [applied]