Add syntax highlighting to the readme file

Author: arturdryomov

README.md

@@ -24,7 +24,9 @@ OR
 
 - Use [Vundle][] by adding to your `.vimrc` Vundle plugins section:
 
-        Plugin 'editorconfig/editorconfig-vim'
+  ```viml
+  Plugin 'editorconfig/editorconfig-vim'
+  ```
 
   Then remember to call `:PluginInstall`.
 
@@ -60,23 +62,31 @@ need to execute `:helptags ALL` so that Vim is aware of editorconfig.txt.
 To ensure that this plugin works well with [Tim Pope's fugitive][], use the
 following patterns array:
 
-    let g:EditorConfig_exclude_patterns = ['fugitive://.*']
+```viml
+let g:EditorConfig_exclude_patterns = ['fugitive://.*']
+```
 
 If you wanted to avoid loading EditorConfig for any remote files over ssh:
 
-    let g:EditorConfig_exclude_patterns = ['scp://.*']
+```viml
+let g:EditorConfig_exclude_patterns = ['scp://.*']
+```
 
 Of course these two items could be combined into the following:
 
-    let g:EditorConfig_exclude_patterns = ['fugitive://.*', 'scp://.*']
+```viml
+let g:EditorConfig_exclude_patterns = ['fugitive://.*', 'scp://.*']
+```
 
 #### Disable rules
 
 You might want to override some project-specific EditorConfig rules in global
 or local vimrc in some cases, e.g., to resolve conflicts of trailing whitespace
 trimming and buffer autosaving.
 
-    let g:EditorConfig_disable_rules = ['trim_trailing_whitespace']
+```viml
+let g:EditorConfig_disable_rules = ['trim_trailing_whitespace']
+```
 
 You are able to disable any supported EditorConfig properties.