add a demos section


Cyprien :
1. no local storage
2. Prefer to monitor RoomAnalitycs change and on each change send the data to your collector to graph/agregate it the way they decide
3. no impact. Activate it out of call

If you want to go you can re-use : http://websrv.ciscofrance.com:15131/map
GitHUb (no map) here : https://github.com/tloyau/cisco-people-presence