Update readme

Author: csouchet

README.md

@@ -21,7 +21,8 @@
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-This R package is an interface to the [BPMN Visualization](https://github.com/process-analytics/bpmn-visualization-js) library (TypeScript).
+This R package is an interface to the [BPMN Visualization](https://github.com/process-analytics/bpmn-visualization-js) library (TypeScript). \
+It enables to visualize the execution data of the processes on BPMN diagrams, using overlays, style customization and interactions.
 
 ## ♻️ Usage
 ### Installation