Update README.markdown

added syntax highlight to make easier to read the options

Author: marabesi

README.markdown

@@ -22,63 +22,79 @@ To install the plugin copy `autoload`, `plugin`, `doc` directories into your `.v
 ### Pathogen
 If you have [Pathogen](http://www.vim.org/scripts/script.php?script_id=2332) installed, clone this repo into a subdirectory of your `.vim/bundle` directory like so:
 
-    cd ~/.vim/bundle
-    git clone git://github.com/nathanaelkane/vim-indent-guides.git
+```
+cd ~/.vim/bundle
+git clone git://github.com/nathanaelkane/vim-indent-guides.git
+```
 
 ### Vundle
 If you have [Vundle](https://github.com/VundleVim/Vundle.vim) installed, add the following line to your `~/.vimrc` in the appropriate spot (see the Vundle.vim README for help):
 
-    Plugin 'nathanaelkane/vim-indent-guides'
+```vim
+Plugin 'nathanaelkane/vim-indent-guides'
+```
 
 and then run the following command from inside Vim:
 
-    :PluginInstall
-
+```vim
+:PluginInstall
+```
 ## Usage
 The default mapping to toggle the plugin is `<Leader>ig`.
 
 You can also use the following commands inside Vim:
 
-    :IndentGuidesEnable
-    :IndentGuidesDisable
-    :IndentGuidesToggle
+```vim
+:IndentGuidesEnable
+:IndentGuidesDisable
+:IndentGuidesToggle
+```
 
 If you would like to have indent guides enabled by default, you can add the following to your `~/.vimrc`:
 
-    let g:indent_guides_enable_on_vim_startup = 1
-
+```vim
+let g:indent_guides_enable_on_vim_startup = 1
+```
 ### gVim
 **This plugin should work with gVim out of the box, no configuration needed.** It will automatically inspect your colorscheme and pick appropriate colors.
 
 ### Setting custom indent colors
 Here's an example of how to define custom colors instead of using the ones the plugin automatically generates for you. Add this to your `.vimrc` file:
 
-    let g:indent_guides_auto_colors = 0
-    autocmd VimEnter,Colorscheme * :hi IndentGuidesOdd  guibg=red   ctermbg=3
-    autocmd VimEnter,Colorscheme * :hi IndentGuidesEven guibg=green ctermbg=4
-
+```vim
+let g:indent_guides_auto_colors = 0
+autocmd VimEnter,Colorscheme * :hi IndentGuidesOdd  guibg=red   ctermbg=3
+autocmd VimEnter,Colorscheme * :hi IndentGuidesEven guibg=green ctermbg=4
+```
 Alternatively you can add the following lines to your colorscheme file.
 
-    hi IndentGuidesOdd  guibg=red   ctermbg=3
-    hi IndentGuidesEven guibg=green ctermbg=4
-
+```vim
+hi IndentGuidesOdd  guibg=red   ctermbg=3
+hi IndentGuidesEven guibg=green ctermbg=4
+```
 ### Terminal Vim
 At the moment Terminal Vim only has basic support. This means is that colors won't be automatically calculated based on your colorscheme. Instead, some preset colors are used depending on whether `background` is set to `dark` or `light`.
 
 When `set background=dark` is used, the following highlight colors will be defined:
 
-    hi IndentGuidesOdd  ctermbg=black
-    hi IndentGuidesEven ctermbg=darkgrey
+```vim
+hi IndentGuidesOdd  ctermbg=black
+hi IndentGuidesEven ctermbg=darkgrey
+```
 
 Alternatively, when `set background=light` is used, the following highlight colors will be defined:
 
-    hi IndentGuidesOdd  ctermbg=white
-    hi IndentGuidesEven ctermbg=lightgrey
+```vim
+hi IndentGuidesOdd  ctermbg=white
+hi IndentGuidesEven ctermbg=lightgrey
+```
 
 If for some reason it's incorrectly defining light highlight colors instead of dark ones or vice versa, the first thing you should check is that the `background` value is being set correctly for your colorscheme. Sometimes it's best to manually set the `background` value in your `.vimrc`, for example:
 
-    colorscheme desert256
-    set background=dark
+```vim
+colorscheme desert256
+set background=dark
+```
 
 Alternatively you can manually setup the highlight colors yourself, see `:help indent_guides_auto_colors` for an example.