Wrote README and some additional comments and moved root-check

README.md

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+# dpkg-frontend #
+This is a simple frontend for dpkg (and apt-get) on Debian-based systems.
+I wrote it as a part of a class assignment. The script uses Zenity to display
+the GTK-dialogs and then executes diffrent commands for different things.
+Note that when installing packages, this runs `apt-get install <PKG> -y`. This
+means that all dependencies will be install without asking.
+
+The script uses as few hardcoded path as possible and then finds the rest of the
+binaries with `which` and puts them variables with the same name as the binarie
+but with an uppercase initial letter.
+
+