Update README

README.md

@@ -1,2 +1,26 @@
 # ucquestiontypes
 Selected University of Canterbury CodeRunner question types plus support files.
+
+## Contents
+Each folder contains an xml export of a question type (i.e. a prototype)
+plus the various support files it uses and its template file.
+You should be able to simply import the xml file into the question bank.
+The support files and the template are within it and are available
+separately only for convenience in editing, updating and viewing. 
+
+Instructions for using the various question types are, as usual, within the prototype.
+You can either edit the prototype file to read the Question text (which is the documentation)
+or create a new question of that type and expand the *Show details* section.
+
+Warning: it is quite possible that the support files will be updated more regularly
+than the xml export. So if you want to guarantee to have the latest version, please
+first check the date of the export (which is within the filename) and compare with
+the modification dates on the support files. Replace any updated support files
+within the prototype.
+
+## Disclaimer
+This repository is primarily for in-house use by the University of Canterbury
+but anyone else if of course welcome to use the question types. If you need
+support you can try posting to the CodeRunner question author's forum, but
+please realise that these question types are not a supported part of
+CodeRunner itself, so no support is guaranteed.