[DOC] Create a new article about "how to use bpmnVisualizationR after installation from CRAN"

[csouchet]

The bpmnVisualization has been renamed, so the former article is no more accurate.

• based on https://medium.com/@process-analytics/using-bpmn-visualization-in-r-91ab92bd5a8d
• due to the renaming to the package, the code is obsolete.
• add a warning in the old article and point to the new one

[tbouffard]

I suggest that we adapt the code example of the previous article as a more advanced getting started article.

• Its goal would be to create the same rendering of the image of the README of the repository as also suggested in [DOC] Create a vignette showing how to generate the image of the README #157. This will create a fresher content and will reuse documentation content.
• In addition, if possible, we should show the CRAN installation. See [FEAT] Submit the package to CRAN #10