Update README.md

Author: igorsimko

README.md

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 # Camunda script editor plugin
 [CodeMirror](https://codemirror.net/) script editor for Camunda modeler.
+## Example
+<img src="https://github.com/igorsimko/camunda-script-editor-plugin/blob/master/example.png" width="450" height="400" />
 
 ## Building the Application