add benchcoach user profile, implement login

benchcoach/migrations/0008_alter_profile_teamsnap_user.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.2.6 on 2021-12-16 18:56
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('teamsnap', '0019_auto_20211216_1851'),
+        ('benchcoach', '0007_teamsnapsettings'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='profile',
+            name='teamsnap_user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='teamsnap.user'),
+        ),
+    ]