Add documentation and source

Added documentation, source and extra files.

source/advanced/various/migrations/0001_initial.py

@@ -0,0 +1,29 @@
+# Generated by Django 3.2 on 2021-04-18 11:28
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Room',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=32, unique=True, verbose_name='name')),
+                ('description', models.TextField(blank=True, verbose_name='description')),
+                ('width', models.PositiveIntegerField(default=0, help_text='centimeters', verbose_name='width')),
+                ('length', models.PositiveIntegerField(default=0, help_text='centimeters', verbose_name='length')),
+                ('height', models.PositiveIntegerField(default=0, help_text='centimeters', verbose_name='height')),
+            ],
+            options={
+                'verbose_name': 'room',
+                'verbose_name_plural': 'rooms',
+            },
+        ),
+    ]