Add a note about the LibreBoard roadmap in the README
Add a note about the LibreBoard roadmap in the README

ahmadassaf/libreboard,guiquanz/libreboard,ahmadassaf/libreboard,xsuperbug/libreboard,ncarlier/libreboard,ahmadassaf/libreboard,ArthurHlt/libreboard-cf,ArthurHlt/libreboard-cf,xsuperbug/libreboard,ncarlier/libreboard,ArthurHlt/libreboard-cf,guiquanz/libreboard