add filetype.vim to override default detection

filetype.vim

@@ -0,0 +1,10 @@
+if exists("did_load_filetypes")
+  finish
+endif
+
+augroup filetypedetect
+  " Override filetypes for certain files
+  autocmd! BufNewFile,BufRead *.frag setfiletype glsl
+  autocmd! BufNewFile,BufRead *.vert setfiletype glsl
+  autocmd! BufNewFile,BufRead *.glsl setfiletype glsl
+augroup END