DOC: Update description in README and include an History section

Co-authored-by: Steve Pieper <pieper@isomics.com>

README.md

@@ -4,6 +4,24 @@ itkMGHImageIO
 ![Build, test, package status](https://github.com/InsightSoftwareConsortium/itkMGHImageIO/workflows/Build,%20test,%20package/badge.svg)
 [![PyPI Version](https://img.shields.io/pypi/v/itk-iomgh.svg)](https://pypi.python.org/pypi/itk-iomgh)
 
-A copy of the Slicer itkMGHImageIO mechanism for ITK.
+ITK remote module for IO of images stored in `mgh`, `mgz` and `mgh.gz` formats.
+
+See https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/MghFormat
+    https://surfer.nmr.mgh.harvard.edu/
+
+## History
+
+The original implementation was developed in the Slicer code base (folder `Slicer/Libs/MGHImageIO`)
+with contributions from Nicole Aucoin, Steve Pieper, Georghe, Dennis Jen, Bruce Fischl, Sebastien Barre, Jim Miller, Bill Lorensen,
+Dominique Belhachemi, Jean-Christophe Fillion-Robin, Julien Finet, Matt McCormick, Hans Johnson, Kent Williams
+and Andras Lasso.
+
+In May 2013, Hans Johnson created the repository `Slicer/itkMGHImageIO` enabling ITK
+based programs to support reading and writing MGH files. See [Slicer/itkMGHImageIO@4fa1fd815](https://github.com/InsightSoftwareConsortium/itkMGHImageIO/commit/4fa1fd8155a697bdd1a2c73f475178220d9fb09f). Between 2013 and 2021, this
+more general implementation has been developed with contributions from Hans Johnson, Mathew Seng, Xiaoxiao Liu, Matt McCormick, Jon Haitz Legarreta, François Budin, Zach Williamson and Jean-Christophe Fillion-Robin.
+
+In September 2015, starting with Slicer commit [Slicer/Slicer@184e907df](https://github.com/Slicer/Slicer/commit/184e907df), Slicer was updated to use the IO provided by `Slicer/itkMGHImageIO` through the ITK remote module mechanism.
+
+Finally, in December 2021, the project originally created in the `Slicer` GitHub organization was transferred to the `InsightSoftwareConsortium` GitHub organization and re-forked into the Slicer one. The
+ITK remote module was also updated to reference the project in the InsightSoftwareConsortium organization. See [InsightSoftwareConsortium/ITK@f84c9ef09](https://github.com/InsightSoftwareConsortium/ITK/commit/f84c9ef0903ff662e6716db2b138509505e85072).
 
-The intent of this repository is to extract the itkMGHImageIO from it's embedded Slicer only implementation and make it accessible to any ITK compliant program.