Update README.md

README.md

 Energy Storage DTC
 ===========
-Materials for use as part of: The Social Science of Energy Storage (PSY6018)
+Materials used in a session for: The Social Science of Energy Storage (PSY6018)
 
-Sheffield/Southampton Centre for Doctoral Training in Energy Storage and its Applications
-
-http://www.southampton.ac.uk/engineering/postgraduate/research_degrees/energy_storage_cdt.page
+A lecture/practical session in the teaching part of [Sheffield/Southampton Centre for Doctoral Training in Energy Storage and its Applications](http://www.southampton.ac.uk/engineering/postgraduate/research_degrees/energy_storage_cdt.page)
 
+ * Readme - this file
+ * .pptx - lecture slides
+ * [Activities](activities.md) - practical R examples/exercises
+ 
 Data used:
  * DECC Household Electricity Survey - https://www.gov.uk/government/collections/household-electricity-survey
  * ONS' UK Time Use survey 2005 - http://discover.ukdataservice.ac.uk/catalogue/?sn=5592