Adding more detailed install instructions to README.md
Adding more detailed install instructions to README.md

doclements/pywps-4,tomkralidis/pywps,jonas-eberle/pywps,ldesousa/PyWPS,bird-house/PyWPS,geopython/pywps,ricardogsilva/PyWPS,SiggyF/pywps-4,jachym/PyWPS