Add README.

README.md

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+# .dotfiles
+
+Configuration files for syncing between machines. See https://www.atlassian.com/git/tutorials/dotfiles for the idea.
+
+## Installation
+
+1. Clone the repo:
+   ```
+   $ git clone --bare https://github.com/fredrikekre/.dotfiles.git $HOME/.dotfiles.git
+   ```
+
+2. Define a temporary `dotfiles` alias:
+   ```
+   $ alias dotfiles='git --git-dir=$HOME/.dotfiles.git/ --work-tree=$HOME'
+   ```
+
+3. Check out the files:
+   ```
+   $ dotfiles checkout
+   ```
+
+4. Add the following to the top of `.bashrc`
+   ```
+   # Include cross-system common parts from .dotfiles.git repo
+   if [ -f ~/.bashrc.dotfiles ]; then
+       . ~/.bashrc.dotfiles
+   fi
+   ```
+
+5. Configure the new local repo to hide untracked files
+   ```
+   $ dotfiles config --local status.showUntrackedFiles no
+   ```
+
+6. Reboot the shell