added multipolygon field to geo modls

geo/models.py

@@ -6,6 +6,7 @@ class Country(models.Model):
     Country model
     """
     name = models.CharField(max_length = 100)
+    geo = models.MultiPolygonField(null=True)
 
     # internal
     created = models.DateTimeField('date of creation', auto_now_add=True)
@@ -45,6 +46,7 @@ class Province(models.Model):
     """
     name = models.CharField(max_length = 100)
     region = models.ForeignKey(Region, on_delete=models.DO_NOTHING, related_name='province')
+    geo = models.MultiPolygonField(null=True)
 
     # internal
     created = models.DateTimeField('date of creation', auto_now_add=True)
@@ -64,6 +66,7 @@ class City(models.Model):
     """
     name = models.CharField(max_length = 250)
     province = models.ForeignKey(Province, on_delete=models.DO_NOTHING, related_name='city', null=True)
+    geo = models.MultiPolygonField(null=True)
 
     # internal
     created = models.DateTimeField('date of creation', auto_now_add=True)