docs: add a start of learning outcome docs

Author: macite

docs/models/feedback/feedback_on_outcomes.md

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+## Feedback on Outcomes
+
+Templates can be provided to help staff provide feedback more efficiently.
+
+* Each Learning Outcome has:
+  * a number of feedback chips
+
+* Feedback chips can be:
+  * Template chips that contain template text to be provided to the student when selected.
+  * Group chips that contain template chips
+
+Tasks have task learning outcomes, units have unit learning outcomes, and the system has global/graduate learning outcomes. So, in the context of a task the teaching staff can see task, unit, and global/graduate outcomes.
+
+Selecting a chip will add the text to the message composer to allow teaching staff to create feedback from guided templates.

docs/models/feedback/learning_outcomes.md

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+# Learning Outcomes
+
+This document outlines how learning outcomes are captured.
+
+High level overview:
+
+* A Learning Outcome captures what needs to be learnt in a given context
+  * Context - a polymorphic relation
+* Context include (bottom up):
+  * Task - what you need to show to complete a task
+  * Unit - what you need to show to complete a unit
+  * nil - global context
+  * TODO: Organisation Grouping - what you need to show in relation to a course, department, school, faculty, or institution
+
+Learning outcomes have:
+* Short description, abbreviation, long description
+* Linked learning outcomes at a higher level -- what does this learning outcome contribute to?
+* Associated feedback chips -- See [Feedback on Outcomes](./feedback_on_outcomes.md)