adding building of docs info to README
adding building of docs info to README

TouK/vumi,vishwaprakashmishra/xmatrix,TouK/vumi,TouK/vumi,harrissoerja/vumi,harrissoerja/vumi,harrissoerja/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix