[FEAT] Add usage examples

[assynour]

Is your feature request related to a problem? Please describe. The newly introduced HACKTOBERFEST low-code or non-code contributions encourage advocacy contributions, in particular case studies. Let's add examples of usage that are related to process-analytics case studies.

Describe the solution you'd like Add examples of bpmn-visualization usage related to process-analytics case studies, including but not limited to:

• [ ] #393
• [ ] #394
• [ ] #395
• [ ] #396
• [ ] #397
• [ ] #398
• [ ] #399
• See also demo and live environment for inspiration.

:warning: HOWTO :warning:

• Put your example in a new external-case-studies directory
• Briefly describe the case study
• Add screenshots of the results

[assynour]

@tbouffard @oanesini