Add a basic vim syntax highlighting file.

bang.vim

@@ -0,0 +1,24 @@
+" Bang syntax file.
+if version < 600
+  syn clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+syn match bsModule          "\<module\>"
+syn match bsStructure       "\<\(class\|datatype\|instance\)\>"
+syn match bsTypedef         "\<\(type\|newtype\)\>"
+syn match bsColonColon      "::"
+syn keyword bsConditional   case of if then else otherwise
+syn keyword bsModifier      export restrict
+syn region bsComment matchgroup=bsCommentStart start="/\*" end="\*/"
+
+
+hi def link bsModule       Include
+hi def link bsStructure    Structure
+hi def link bsTypedef      Typedef
+hi def link bsModifier     StorageClass
+hi def link bsConditional  Conditional
+hi def link bsColonColon   Type
+hi def link bsComment      Comment
+hi def link bsCommentStart Comment