new_contents: from django.db import models
  from sorl.thumbnail import ImageField
  
  from accelerator_abstract.models.accelerator_model import AcceleratorModel
  
  
  class InnovationStage(AcceleratorModel):
      name = models.CharField(max_length=255)
      description = models.TextField()
      image = ImageField(upload_to='innovation_stage_images', blank=True, null=True)
      display_priority = models.PositiveIntegerField()
  
subject: add innovation stage model