pov: Add exercise, version, cases, description, comments, property
pov: Add exercise, version, cases, description, comments, property

At this point, if only the `trees` key were to be deleted, this file
would conform to the schema as desired by #625.

We will need to delete the `trees` key using the plan set out in #699.

petertseng/x-common,ErikSchierboom/x-common,jmluy/x-common,petertseng/x-common,Vankog/problem-specifications,rpottsoh/x-common,kgengler/x-common,kgengler/x-common,ErikSchierboom/x-common,rpottsoh/x-common,jmluy/x-common,Vankog/problem-specifications,exercism/x-common,jmluy/x-common,exercism/x-common