Add graphql, closes #206

ftplugin/graphql.vim

@@ -0,0 +1,17 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'graphql') == -1
+  
+" Vim filetype plugin
+" Language: GraphQL
+" Maintainer: Jon Parise <jon@indelible.org>
+
+if (exists("b:did_ftplugin"))
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=:#
+setlocal commentstring=#\ %s
+setlocal formatoptions-=t
+setlocal iskeyword+=$,@-@
+
+endif