User Workflow How to docs

[JackEAllen]

Sit down with IMAT and document a variety of workflows using Mantid Imaging for a variety of datasets to help users better understand how to work through data and why they may wish to apply certain operations over others and why they may wish to play around with configuration values when reconstructing their data and how to compare different filters etc, including what to look for in a given sample when exploring data in this fashion.