Build reference for missing __init__.py files (#3227)

docs/reference/hub/__init__.md

@@ -0,0 +1,44 @@
+---
+description: Access Ultralytics HUB, manage API keys, train models, and export in various formats with ease using the HUB API.
+keywords: Ultralytics, YOLO, Docs HUB, API, login, logout, reset model, export model, check dataset, HUBDatasetStats, YOLO training, YOLO model
+---
+
+# login
+---
+:::ultralytics.hub.login
+<br><br>
+
+# logout
+---
+:::ultralytics.hub.logout
+<br><br>
+
+# start
+---
+:::ultralytics.hub.start
+<br><br>
+
+# reset_model
+---
+:::ultralytics.hub.reset_model
+<br><br>
+
+# export_fmts_hub
+---
+:::ultralytics.hub.export_fmts_hub
+<br><br>
+
+# export_model
+---
+:::ultralytics.hub.export_model
+<br><br>
+
+# get_export
+---
+:::ultralytics.hub.get_export
+<br><br>
+
+# check_dataset
+---
+:::ultralytics.hub.check_dataset
+<br><br>