add textfield notes to Order for internal orga notes about the order

src/shop/migrations/0057_order_notes.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.0.4 on 2018-08-27 10:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shop', '0056_auto_20180827_1020'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='notes',
+            field=models.TextField(blank=True, default='', help_text='Any internal notes about this order can be entered here. They will not be printed on the invoice or shown to the customer in any way.'),
+        ),
+    ]

src/shop/models.py

@@ -133,6 +133,12 @@ class Order(CreatedUpdatedModel):
         blank=True
     )
 
+    notes = models.TextField(
+        help_text='Any internal notes about this order can be entered here. They will not be printed on the invoice or shown to the customer in any way.',
+        default='',
+        blank=True,
+    )
+
     objects = OrderQuerySet.as_manager()
 
     def __str__(self):