Update examples/external_models/lightfm/README.md
Update examples/external_models/lightfm/README.md

Co-Authored-By: Frigó Erzsébet <e7962ee170757ec0ea8efbbe1aac1aee1a2b8547@info.ilab.sztaki.hu>
proto-n/Alpenglow,rpalovics/Alpenglow,rpalovics/Alpenglow,proto-n/Alpenglow,rpalovics/Alpenglow,proto-n/Alpenglow