Add syntax files from upstream vim repository

indent/scheme.vim

@@ -0,0 +1,15 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim indent file
+" Language:	Scheme
+" Maintainer:	Sergey Khorev <sergey.khorev@gmail.com>
+" Last Change:	2005 Jun 24
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+runtime! indent/lisp.vim
+
+endif