add Pathogen and Vundle instructions to the README

Author: chocolateboy

README.md

@@ -2,6 +2,16 @@
 
 ## Installation
 
+### [Vundle](https://github.com/gmarik/Vundle.vim)
+
+Add `Plugin 'udalov/kotlin-vim'` to your `~/.vimrc` and run `PluginInstall`.
+
+### [Pathogen](https://github.com/tpope/vim-pathogen)
+
+    $ git clone https://github.com/udalov/kotlin-vim ~/.vim/bundle/
+
+### Manual
+
 0. `mkdir -p ~/.vim/{syntax,indent,ftdetect}`
 1. `cp syntax/kotlin.vim ~/.vim/syntax/kotlin.vim`
 2. `cp indent/kotlin.vim ~/.vim/indent/kotlin.vim`