Adding installation procédure
bugfix :

markus.offergeld (Xilinx forums) remarks that pyV2S was not tolerrant to Coding style variation and provide the bugfix

THANKS
rndhro (Github) remarks other coding style (port position) vulnerability

fix by inproving entity parsing
THANKS
Merge branch 'master' of github.com:LaurentCabaret/pyVhdl2Sch