add attempt_count to config docs, set value to 1 in inital task save

django_q/cluster.py

@@ -497,6 +497,7 @@ def save_task(task, broker: Broker):
                 result=task["result"],
                 group=task.get("group"),
                 success=task["success"],
+                attempt_count=1
             )
     except Exception as e:
         logger.error(e)

django_q/migrations/0013_task_attempt_count.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.7 on 2020-08-11 15:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_q', '0012_auto_20200702_1608'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='task',
+            name='attempt_count',
+            field=models.IntegerField(default=0),
+        ),
+    ]