Added link to point back to the PI Square page that contains the whitepaper
Added link to point back to the PI Square page that contains the whitepaper

pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper,pthivierge/PI-Web-API-White-Paper