[doc] Added MPICH Installer's guide
[doc] Added MPICH Installer's guide

dcere/pfc,NeilBryant/pfc,NeilBryant/pfc,dcere/pfc,NeilBryant/pfc,dcere/pfc,dcere/pfc,dcere/pfc,NeilBryant/pfc,dcere/pfc,dcere/pfc,NeilBryant/pfc