add explanation of building the browser bundle to README
add explanation of building the browser bundle to README

iobond/bitcore,TeamPiggyCoin/PiggyCore,initaldk/bitcore,pnagurny/bitcore,Kefkius/clamcore,pembo210/Litecore,Bushstar/talentcore,MulticoinExplorer/bitcore,UdjinM6/darkcore,casinocoin/csc-bitcore-v0.1,TOMOAKI12345/bitcore,habibmasuro/reddcore,habibmasuro/reddcore,bankonme/bitcore,sEpuLchEr/bitcore,Bushstar/bollycore,bitpay/bitcore,casinocoin/csc-bitcore-v0.1,pembo210/Litecore,Bushstar/talentcore,Kefkius/clamcore,MonetaryUnit/bitcore,MonetaryUnit/bitcore,Kefkius/clamcore,habibmasuro/reddcore,olalonde/bitcore,Kefkius/clamcore,litecoin-project/litecore,bitjson/bitcore,eordano/bitcore,braydonf/bitcore,iobond/bitcore,Kefkius/clamcore,janko33bd/bitcore,bilthon/bitcore,pembo210/Litecore,pembo210/Litecore,Bushstar/talentcore,williamcotton/bitcore,casinocoin/csc-bitcore-v0.1,bankonme/bitcore,olalonde/bitcore,sEpuLchEr/bitcore,MulticoinExplorer/bitcore,UdjinM6/darkcore,daxxog/clamcore,adjoinant/bitcore,bitjson/bitcore,bilthon/bitcore,KainiIndustries/hullcore,maraoz/coinforge,Bushstar/feathercore,bitjson/bitcore,genecyber/bitcore,phplaboratory/bitcore,TeamPiggyCoin/PiggyCore,janko33bd/bitcore,bitpay/bitcore,bitpay/bitcore,lekkas/bitcore,KainiIndustries/hullcore,iobond/bitcore,casinocoin/csc-bitcore-v0.1,eXcomm/bitcore,casinocoin/csc-bitcore-v0.1,KainiIndustries/hullcore,williamcotton/bitcore,jcvernaleo/bitcore,KainiIndustries/hullcore,Bushstar/feathercore,UdjinM6/darkcore,habibmasuro/reddcore,Bushstar/bollycore,braydonf/bitcore,MulticoinExplorer/bitcore,Bushstar/bollycore,Bushstar/feathercore,maraoz/coinforge,phplaboratory/bitcore,litecoin-project/litecore,UdjinM6/darkcore,iobond/bitcore,jcvernaleo/bitcore,KainiIndustries/hullcore,UdjinM6/bitcore-dash,martindale/bitcore,martindale/bitcore,UdjinM6/darkcore,adjoinant/bitcore,lekkas/bitcore,Bushstar/bollycore,habibmasuro/reddcore,sEpuLchEr/bitcore,bitjson/bitcore,KainiIndustries/hullcore,martindale/bitcore,iobond/bitcore,martindale/bitcore,TOMOAKI12345/bitcore,genecyber/bitcore,initaldk/bitcore,Bushstar/talentcore,MulticoinExplorer/bitcore,sEpuLchEr/bitcore,eordano/bitcore,daxxog/clamcore,Bushstar/feathercore,MulticoinExplorer/bitcore,GroestlCoin/groestlcore,UdjinM6/darkcore,casinocoin/csc-bitcore-v0.1,bitpay/bitcore,eXcomm/bitcore,pnagurny/bitcore,sEpuLchEr/bitcore