README: minor improvements
README: minor improvements

 - add note about ldconfig
 - add few shell snippets

thojongle/heekscad,tbinias/heekscad,Powerino73/heekscad,DINKIN/heekscad,tectronics/heekscad,Powerino73/heekscad,singwina/heekscad,namoamitof/heekscad,DINKIN/heekscad,singwina/heekscad,pyrotron/heekscad,pyrotron/heekscad,Nurb432/heekscad,Nurb432/heekscad,FluffyMortain/heekscad,ahmetsemihparlak/heekscad,Powerino73/heekscad,singwina/heekscad,tbinias/heekscad,Nurb432/heekscad,AlanZheng/heekscad,AlanZheng/heekscad,tbinias/heekscad,thojongle/heekscad,namoamitof/heekscad,DINKIN/heekscad,pyrotron/heekscad,ahmetsemihparlak/heekscad,singwina/heekscad,Powerino73/heekscad,AlanZheng/heekscad,tbinias/heekscad,ahmetsemihparlak/heekscad,FluffyMortain/heekscad,thojongle/heekscad,AlanZheng/heekscad,tectronics/heekscad,DINKIN/heekscad,thojongle/heekscad,pyrotron/heekscad,ahmetsemihparlak/heekscad,Nurb432/heekscad,FluffyMortain/heekscad,tectronics/heekscad,namoamitof/heekscad,FluffyMortain/heekscad,namoamitof/heekscad,tectronics/heekscad