Updated README.md
Updated README.md

Fixed and extended installation section
KnowledgeFinder/knowledgefinder.github.io,KnowledgeFinder/knowledgefinder.github.io,DLR-SC/rce-website,DLR-SC/rce-website,KnowledgeFinder/knowledgefinder.github.io,KnowledgeFinder/knowledgefinder.github.io,DLR-SC/rce-website,DLR-SC/rce-website,DLR-SC/rce-website,KnowledgeFinder/knowledgefinder.github.io