Update README.md

Author: luke-marshall

README.md

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 It is based on the work of Mike Roberts, Luke Marshall and Naomi Stringer at the Center for Energy and Environmental Markets, UNSW. Additional software development has been completed by David Martin. 
 
+![Screenshot 2019-05-17 12 04 13](https://user-images.githubusercontent.com/7201209/57900484-f52ad600-789b-11e9-98eb-91410324fad5.png)
+![Screenshot 2019-05-17 12 03 19](https://user-images.githubusercontent.com/7201209/57900486-f5c36c80-789b-11e9-9a06-bd73106e7aa4.png)
+![Screenshot 2019-05-17 12 03 01](https://user-images.githubusercontent.com/7201209/57900487-f5c36c80-789b-11e9-920c-e6515eea7915.png)
+![Screenshot 2019-05-17 12 02 41](https://user-images.githubusercontent.com/7201209/57900488-f5c36c80-789b-11e9-9d8c-e53861a14708.png)
+![Screenshot 2019-05-17 12 02 15](https://user-images.githubusercontent.com/7201209/57900489-f65c0300-789b-11e9-84e0-7fd8d3416ce7.png)
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 # Downloading
 The current standalone release can be downloaded from the Releases page [here](https://github.com/luke-marshall/energy-sharing/releases).