add project models

        unique_together = (("key", "user"),)

class Project(models.Model):

    label = models.TextField()

    description = models.TextField()

class Role(models.Model):

    label = models.TextField

class ProjectMembership(models.Model):

    project = models.ForeignKey(Project, on_delete=models.CASCADE)

    user = models.ForeignKey(User, on_delete=models.CASCADE)

    role = models.ForeignKey(Role, on_delete=models.CASCADE)

class Tag(models.Model):

    uid = models.TextField()

    ark = models.TextField(null=True, blank=True)

        "label": tag_instance.label or tag_instance.uid,

        "ark": tag_instance.ark,

    }

def project(project_instance: models.Project) -> dict:

    return {"id": project_instance.pk, "label": project_instance.label}