signup: add referrer

app/signup/migrations/0002_signup_referrer.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.2 on 2024-02-27 16:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('signup', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='signup',
+            name='referrer',
+            field=models.CharField(blank=True, max_length=255),
+        ),
+    ]