update readme

README.md

-# visb-visualisation-examples
+# VisualisationExamplesForVisB
 
+## What is VisB?
+
+VisB is an svg-based visualisation plugin for ProB2-UI.
+
+## Setting up VisB
+
+You will need to download a recent version of [ProB2-UI](https://www3.hhu.de/stups/prob/index.php/Download#ProB2_UI_using_Java_FX).
+
+After that, you can follow [these](https://www3.hhu.de/stups/prob/index.php/VisB) instructions.