Add an example for MAXScript

MAXScript is the built-in scripting language of Autodesk's 3DS Max, a 3D
modelling and animation suite. The language features fleeting semblances
to Haskell in its comment syntax and expression-based nature, though the
language itself is procedural instead of purely-functional.

See also:
* http://www.autodesk.com/3dsmax-maxscript-2012-enu
* https://github.com/Alhadis/language-maxscript
* https://atom.io/packages/language-maxscript

m/maxscript.ms

@@ -0,0 +1,7 @@
+print "Hello, world!"
+-- "Hello, world!"
+
+
+-- Note that MAXScript is expression-based, so simply writing "Hello, world!" is
+-- sufficient to echo it for the reader. Like Haskell, all MAXScript expressions
+-- *must* return values, even if they're unused.