Add documentation

README.md

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+# Emacs Config
+This is just my personal Emacs configuration. I use Emacs for mail, RSS, and, of
+course, editing text. Most of the configuration is in `init.el`. I use
+`use-package` for every package, even built-in ones. You can try searching for
+"use-package" and then the name of the package to find the line where its
+configuration start.
+
+The `elisp` directory holds some extra configuration for specific things that I
+thought was too big to fit into `init.el`.