code: public MethodInfo addConstructor(Modifiers modifiers,
                                       TypeDesc[] params) {
          MethodDesc md = MethodDesc.forArguments(null, params);
          MethodInfo mi = new MethodInfo(this, modifiers, "<init>", md);
          mMethods.add(mi);
          return mi;
      }
docs: Add a constructor to this class.
  
  @param params May be null if constructor accepts no parameters.