Added batsh.batsh file in Batsh language.

Batsh is a language that compiles to bash scripts or Windows batch files (.bat).
This allows to run the resulting script without any dependencies on target
platform.

More info about batsh:

http://batsh.org/
https://github.com/BYVoid/Batsh

b/batsh.batsh

@@ -0,0 +1 @@
+println("Hello world");