Add Map example

Author: luc-blaeser

MapExample.mo

@@ -0,0 +1,15 @@
+import Map "mo:core/object-oriented/Map";
+import Nat "mo:core/Nat";
+
+persistent actor Actor {
+  let map = Map.Map<Nat, Text>(Nat.compare);
+
+  public func main() : async () {
+    assert map.isEmpty();
+    map.add(1, "One");
+    assert map.get(1) == ?"One";
+    map.remove(1);
+    assert map.get(1) == null;
+  }
+};
+await Actor.main()