[docs #24] added contributing guide
[docs #24] added contributing guide

kjvalencik/highland,megawac/highland,Andolamin/highland,kwangkim/highland,quarterto/highland,svozza/highland,Andolamin/highland,caolan/highland,dayoadeyemi/highland,jgrund/highland,icio/highland,vqvu/highland,megawac/highland,jgrund/highland,Whoaa512/highland,kwangkim/highland,vqvu/highland,dayoadeyemi/highland,Whoaa512/highland,caolan/highland,icio/highland,kjvalencik/highland,surgeforward/highland,svozza/highland,surgeforward/highland