add Load ParticipantsRegistry.ipynb notebook
add Load ParticipantsRegistry.ipynb notebook

PythonSanSebastian/ep-tools,PythonSanSebastian/ep-tools,EuroPython/ep-tools,EuroPython/ep-tools,EuroPython/ep-tools,EuroPython/ep-tools,PythonSanSebastian/ep-tools,PythonSanSebastian/ep-tools