add installation guides to README.md
add installation guides to README.md

ecamp/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,ecamp/ecamp3,usu/ecamp3,usu/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3