Add IntelliJ IDEA project configuration files

This commit adds IntelliJ IDEA-specific configuration files for the project, including module setup, version control integration, inspection profiles, and workspace settings. These files facilitate development environment configuration for contributors using IntelliJ IDEA.

accounts/models.py

@@ -2,6 +2,9 @@ from django.contrib.auth.models import AbstractUser
 from django.db import models
 
 class ClientPermission(models.Model):
+    codename = models.CharField(max_length=100, default='')
+    name = models.CharField(max_length=255, default='')
+
     class Meta:
         managed = True
         default_permissions = ()
@@ -10,7 +13,8 @@ class ClientPermission(models.Model):
             ('can_view_bookings', 'Can view bookings'),
             ('can_manage_company_users', 'Can manage company users'),
         )
-
+    def __str__(self):
+        return self.name
 
 class DepotUser(AbstractUser):