code: public void toInstance(Config configuration) {
          Preconditions.checkNotNull(configuration, "Configuration Instance cannot be null.");
  
          if (annotationClass == null) {
              binder.bind(configClass).toInstance(configuration);
  
          } else {
              binder.bind(configClass).annotatedWith(annotationClass).toInstance(configuration);
          }
      }
docs: This method will bind the class to a particular instance.
  
  @param configuration