Changes

RetroArch has a robust CLI for those who prefer the command line, there are also man pages which should have been installed by default for retro-arch, retroarch-joyconfig and others.  If you use the CLI be sure to configure your retroarch.cfg file before first use.  This config is well commented so each option can be fully understood.  Use retroarch-joyconfig command for simplified input setup.  RetroArch can auto-detect inputs, which is a great feature to simplify playing with multiple/different controllers (refer to "man retroarch-joyconfig " for details).  The retroarch.cfg file should be located in /etc/retroarch.cfg, your home folder or the directory where retroarch was installed depending on your distro and compilation setup.