add UserInfo struct description
add UserInfo struct description

jsforce/jsforce,bhaskarmelkani/jsforce,pcon/jsforce,lkatney/jsforce,kimchouard/jsforce,lkatney/jsforce,saleswise/jsforce,saleswise/jsforce,polidog/jsforce,jesperkristensen/jsforce,rdietrick/jsforce,jesperkristensen/jsforce,jdcrensh/jsforce,nutthawan/jsforce,pcon/jsforce,parthiban019/jsforce,stomita/node-salesforce,jdcrensh/jsforce,jsforce/jsforce,nutthawan/jsforce,saleswise/jsforce,joeferraro/jsforce,bhaskarmelkani/jsforce,joeferraro/jsforce,pcon/jsforce,jsforce/jsforce,parthiban019/jsforce