Adds framework for documentation of user and global settings

docs/settings/tasks.md

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+---
+title: Background Tasks
+---
+
+## Background Tasks
+
+In addition to managing the database and providing a web interface, InvenTree runs various background tasks;
+
+### Blocking Operations
+
+Some tasks (such as sending emails or performing bulk database actions) may take a significant amount of time. Instead of delaying the response to the user, these tasks are handled by the background task manager.
+
+### Periodic Tasks
+
+Some tasks must be performed on a regular, periodic basis. 
+
+## Django Q 
+
+InvenTree uses the [django-q](https://django-q.readthedocs.io/en/latest/) background task manager.
+
+### Running Worker
+
+The Django Q work must run separately to the web server. This is started as a separate process, as part of the InvenTree installation instructions.
+
+If the worker is not running, a warning indicator is displayed in the InvenTree menu bar.
+
+## Admin Interface
+
+Scheduled tasks can be viewed in the InvenTree admin interface.