add ordsets.pl to README
@@ -356,6 +356,8 @@ The modules that ship with Scryer&nbsp;Prolog are also called
providing `empty_assoc/1`, `get_assoc/3`, `put_assoc/4` etc.
to manage elements in AVL&nbsp;trees which ensure
*O*(log(*N*))&nbsp;access.
+* [`ordsets`](src/prolog/lib/ordsets.pl)
+ represents ordered sets as lists.
* [`clpb`](src/prolog/lib/clpb.pl)
CLP(B): Constraint Logic Programming over Boolean variables,
a BDD-based SAT&nbsp;solver provided via the predicates
