add vim syntax file

contrib/fut.vim

@@ -0,0 +1,17 @@
+syntax keyword futKeywords module wire reg wire input output proc if else
+
+highlight default link futKeywords Keyword
+
+setlocal indentexpr=FutIndent()
+
+function! FutIndent()
+  let line = getline(v:lnum)
+  let previousNum = prevnonblank(v:lnum - 1)
+  let previous = getline(previousNum)
+
+  if previous =~ "{" && previous !~ "}" && line !~ "}"
+    return indent(previousNum) + &tabstop
+  endif
+
+  return indent(previousNum)
+endfunction