FridaTveit
69e8ba1363
Add hints to exercises without starter implementation (#1084)
* Add hints to exercises without starter implementation
As exercises with difficulty 5 are the first exercises without starter
implementation, they should have a hints file explaining how to fix the
compiler errors that occur when an exercise doesn't have any starter
implementation.
This should be detailed in the policies doc.
* flatten-array: regenerate README
Also update description for how to generate readme as it was lacking
detail.