code: public static Builder from(String swaggerString) {
          Validate.notEmpty(swaggerString, "swaggerString must not be null");
          return from(new StringReader(swaggerString));
      }
docs: Creates a Swagger2MarkupConverter.Builder from a given Swagger YAML or JSON String.
  
  @param swaggerString the Swagger YAML or JSON String.
  @return a Swagger2MarkupConverter