added api endpoints and tests

cookbook/migrations/0073_auto_20200708_2311.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-07-08 21:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cookbook', '0072_step_show_as_header'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='sync',
+            name='last_checked',
+            field=models.DateTimeField(null=True),
+        ),
+    ]