vim: add racket indentation config

vim/vimrc

@@ -126,6 +126,13 @@ fu _agw.close_empty()
 	endif
 endfu
 
+fu _agw.setup_rkt()
+	setlocal shiftwidth=2
+	setlocal tabstop=2
+	setlocal softtabstop=2
+	setlocal expandtab
+endfu
+
 fu _agw.setup_asm()
 	setlocal shiftwidth=8
 	setlocal tabstop=8
@@ -448,6 +455,9 @@ endif
 " markdown sucks
 au FileType markdown set comments+=fb:- comments-=b:- indentexpr=
 
+" Racket options
+au FileType racket call _agw.setup_rkt()
+
 " ASM options
 au BufEnter *\.asm,*\.s,*\.inc,*\.i call _agw.setup_asm()