Add .gitignore to ignore all files by default

.gitignore

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+*

README.md

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 # hoellen/dotfiles
 
 Here you can see my dotfiles, which I use in my everyday life. Not everything is perfect and complete, yet.
+
+# Installation
+
+To install the dotfiles you need to be in your users home directory and clone the repository:
+
+```
+git init
+git remote add origin https://code.hoellen.eu/hoellen/dotfiles.git
+git fetch
+git checkout -t origin/master
+```
+
+To hide the git status in the fish prompt (`➜  ~ git:(master)`) you need to set `git config fish.hide-status 1` for the repository.
+