Ctags updates installation

Ctags updated installation (with Markdown for Debian/Ubuntu); added command for Arch Linux.

README.md

@@ -15,7 +15,14 @@ The awesome version includes a lot of great plugins, configurations and color sc
 	git clone https://github.com/amix/vimrc.git ~/.vim_runtime
 	sh ~/.vim_runtime/install_awesome_vimrc.sh
 
-The taglist.vim plugin will require ctags (http://ctags.sourceforge.net) (Debian: apt-get install ctags)
+The taglist.vim plugin will require ctags (http://ctags.sourceforge.net) 
+For Debian and Ubuntu: 
+
+	apt-get install ctags
+
+For Arch Linux:
+
+	pacman -S ctags
 
 I also recommend using [Source Code Pro font from Adobe](http://store1.adobe.com/cfusion/store/html/index.cfm?event=displayFontPackage&code=1960) (it's free and awesome font for writing and programming). The Awesome vimrc is already setup to try to use it