add contribute section to readme

gcontini

2019-09-12 f3acedda9e1a23b9bd50230177361356cc254956

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MACRO(EVAL_CONDITION name)
   IF(${ARGN})
     SET(${name} 1)
   ELSE(${ARGN})
     SET(${name} 0)
   ENDIF(${ARGN})
ENDMACRO(EVAL_CONDITION)