Add nano syntax highlighting

syntax-highlighting/def.nanorc

@@ -0,0 +1,17 @@
+syntax def "\.def$"
+comment "//"
+
+# Commands
+color magenta "\<(extends|size|vtable(-size)?|property|static-property(-array)?|((static|virtual)-)?method|constructor)\>"
+
+# Types
+color green "\<(char|uchar|int|uint|float|bool|void|std::(string|vector|map))\>"
+
+# Numbers
+color yellow "0x[a-f0-9]+"
+
+# Comments
+color brightblue "//.*"
+
+# Trailing whitespace.
+color ,green "[[:space:]]+$"