Define MAXScript's language traits

The colour chosen to represent the language is taken from Autodesk's own
colouring scheme, which should easily be recognised by their userbase.

lib/linguist/languages.yml

@@ -1956,6 +1956,15 @@ M:
   tm_scope: source.lisp
   ace_mode: lisp
 
+MAXScript:
+  type: programming
+  color: "#00aaaa"
+  extensions:
+  - .ms
+  - .mcr
+  tm_scope: source.maxscript
+  ace_mode: text
+
 MTML:
   type: markup
   color: "#b7e1f4"