Add rainbow CSV highlighting rules (12 column coverage)

Inspired by https://github.com/mechatroner/rainbow_csv

csv.nanorc

@@ -0,0 +1,16 @@
+# Rainbow CSV highlighting rules (12 column coverage)
+# Inspired by https://github.com/mechatroner/rainbow_csv
+syntax "CSV" "\.csv$"
+
+color brightmagenta "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color brightcyan "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color brightblue "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color brightyellow "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color brightgreen "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color brightred "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?([^,]*,?))?"
+color cyan "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?"
+color magenta "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?"
+color blue "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,)?([^,]*,)?([^,]*,)?([^,]*,)?"
+color yellow "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,)?([^,]*,)?([^,]*,)?"
+color green "^("([^"]*"")*[^"]*",?)("([^"]*"")*[^"]*",?)|^([^,]*,)?([^,]*,)?"
+color red "^("([^"]*"")*[^"]*",?)|^([^,]*,?))?"