Syntax Highlighting with nano - nanorc for maincf

From NAS-Tweaks

### all *cf files (e.g. main.cf, Postfix )
syntax "maincf" "(\.|/|)cf$"
color magenta "\=.*$"
color green "#.*$"
color cyan "[A-Z0-9\_]+="
color blue ""(\\.|[^\"])*""
color red "\@"