Add basic syntax files

- Set the filetype to "vue" for files with a .vue extension
 - Define regions for <template>, <style>, and <script> tags
 - Include HTML, CSS, and JavaScript syntax highlighting for the <template>,
   <style>, and <script> regions

README.md

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+Vim syntax highlighting for [Vue
+components](http://vuejs.org/guide/application.html#Single_File_Components).

ftdetect/vue.vim

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+au BufNewFile,BufRead *.vue setf vue

syntax/vue.vim

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+" Vim syntax file
+" Language:	Vue.js
+" Maintainer:	W. Evan Sheehan
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syntax include @HTML syntax/html.vim
+unlet b:current_syntax
+syntax region template keepend start=/<template\( lang="[a-zA-Z]\+"\)\?>/ end="</template>" contains=@HTML fold
+
+syntax include @JS syntax/javascript.vim
+unlet b:current_syntax
+syntax region script keepend start=/<script\( lang="[a-zA-Z]\+"\)\?>/ end="</script>" contains=@JS fold
+
+syntax include @CSS syntax/css.vim
+unlet b:current_syntax
+syntax region style keepend start=/<style\( lang="[a-zA-Z]\+"\)\?>/ end="</style>" contains=@CSS fold
+
+let b:current_syntax = "vue"