* README: add some mu introduction text

README

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+Welcome to mu!
+--------------
+
+Given the enormous amounts of e-mail many people gather and the importance of
+e-mail message in our work-flows, it's essential to quickly deal with all that
+mail - in particular, to instantly find that one important e-mail you need right
+now.
+
+mu[1] is a tool for dealing with e-mail messages stored in the Maildir-format. mu's
+main purpose is to help you to quickly find the messages you need; in addition,
+it allows you to view messages, extract attachments, create new maildirs, … See
+the mu cheatsheet[2] for some examples.
+
+Searching works by first indexing your messages into a Xapian-database, which
+can then be queried using a custom query language.
+
+Built on top of mu there are some extensions:
+
+  * mu-for-emacs (mu4e): a full-features e-mail client that runs inside emacs
+  * mu-guile: bindings for the Guile/Scheme programming language
+
+Mu is primarily written in C and a bit of C++, with parts of mu4e written in
+Emacs-lisp and mu-guile in Scheme.
+
+Note, mu is available in Debian/Ubuntu under the name "maildir-utils" because
+they don't like short names.
+
+[1] http://www.djcbsoftware.nl/code/mu/
+[2] http://www.djcbsoftware.nl/code/mu/cheatsheet.html