code: public static <K, V> ImmutableMapParameter<K, V> of(K k0, V v0) {
          Map<K, V> map = Collections.singletonMap(k0, v0);
          return new ImmutableMapParameter<K, V>(map);
      }
docs: Returns an ImmutableMapParameter instance containing a single entry.
  
  @param k0
  Key of the single entry.
  @param v0
  Value of the single entry.