Add support for purchase ownership information

Closes #48

games/migrations/0013_purchase_ownership_type.py

@@ -0,0 +1,31 @@
+# Generated by Django 4.1.5 on 2023-02-18 19:54
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("games", "0012_purchase_price_purchase_price_currency"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="purchase",
+            name="ownership_type",
+            field=models.CharField(
+                choices=[
+                    ("ph", "Physical"),
+                    ("di", "Digital"),
+                    ("du", "Digital Upgrade"),
+                    ("re", "Rented"),
+                    ("bo", "Borrowed"),
+                    ("tr", "Trial"),
+                    ("de", "Demo"),
+                    ("pi", "Pirated"),
+                ],
+                default="di",
+                max_length=2,
+            ),
+        ),
+    ]