Add PartStart model

- Links parts to users

InvenTree/part/migrations/0016_partstar.py

@@ -0,0 +1,24 @@
+# Generated by Django 2.2 on 2019-05-04 22:45
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('part', '0015_partcategory_default_location'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='PartStar',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('part', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='starred_users', to='part.Part')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='starred_parts', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]