add contract models and register this models admin panel

core/apps/shared/models/__init__.py

@@ -1 +1,2 @@
-from .base import *
+from .base import *
+from .folder import *

core/apps/shared/models/folder.py

@@ -0,0 +1,15 @@
+from django.db import models
+
+from core.apps.shared.models.base import BaseModel
+
+
+class Folder(BaseModel):
+    name = models.CharField(max_length=200)
+
+    def __str__(self):
+        return self.name
+    
+    class Meta:
+        verbose_name = 'folder'
+        verbose_name_plural = 'folders'
+        db_table = 'folders'