Add short explanation of repo

README.md

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 # Schneiders Dotfiles
 
-Here are my most important dotfiles.
+In this repo you will find my config files of my command line setup and some
+info about my overall way of computing.
+
+## Shell: [zsh](http://zsh.org/)
+
+After a long time using the well known bash I switched to zsh. I don't exactly
+remember the reasons for switching, probably I just wanted to give it a try, but
+found it to be a good alternative.
+You can't say zsh, without naming
+[oh-my-zsh](https://github.com/robbyrussell/oh-my-zsh), an incredibly good,
+'community-driven framework for managing your zsh configuration'.
+Just simply install it and you have a great abundance of themes, plugins and
+other goodies right at your hands, which will make your everyday life at the
+command line a lot easier.
+
+## [tmux](https://github.com/tmux/tmux/wiki)
+
+Tmux is a terminal multiplexer, which means, that you can have several virtual
+terminals in one 'real' terminal instance. You can also have multiple sessions
+and switch between them. Splitting up your window in different terminals is also
+possible, of course.
+
+You can also have some cool info displayed in the lower status line, like
+current time, hostname and even the [currently played
+song](https://git.schneider-hosting.de/schneider/dotfiles/src/branch/master/tmux/theme.sh#L55)
+in clementine.
+
+Switching between the tabs is as easy as pressing `<Ctrl>a <Ctrl>h|l`, depending
+in which direction you want to go.
+
+## Installation
+
+Executing `./install.sh` will install the configuration. It will download
+oh-my-zsh, set zsh as default shell and links all important configuration
+files.