Update installing-icon-libraries.md
Update installing-icon-libraries.md

I followed these steps, using npm instead of yarn so I added the example.

I also found the files in node_modules are stored without the .min. sufix so it was not working with these filenames
quasarframework/quasar,fsgiudice/quasar,quasarframework/quasar,pdanpdan/quasar,fsgiudice/quasar,fsgiudice/quasar,pdanpdan/quasar,quasarframework/quasar,rstoenescu/quasar-framework,rstoenescu/quasar-framework,quasarframework/quasar,pdanpdan/quasar,pdanpdan/quasar,rstoenescu/quasar-framework