Add README

Initial draft of the README. Include a description of the program,
installation and uninstallation directions, and license information.

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+alias-auto-add
+==============
+
+Adds unique aliases to a Mutt alias file.
+
+When viewing an email in Mutt, this program is set as a display filter that
+stores an alias for the from address. Aliases will thus be generated
+automatically when reading email.
+
+The program reads an email from STDIN and tries to add an alias for the from
+address listed. If the given alias already exists, a new unique alias is
+generated and used instead. This allows us to always capture an alias even if a
+person has multiple email addresses.
+
+Inspired by W. Caleb McDaniel's aliasing script published at:
+http://wcm1.web.rice.edu/mutt-tips.html. This adds the advantage of creating a
+new unique alias for all email addresses regardless of whether the sender's name
+is duplicated.
+
+
+## Install
+A binary built for Mac OS X is available on the [releases][1] page. Download the
+binary, put it in your `PATH`, and skip to step 2.
+
+For other platforms, you'll need the [Rust][2] compiler.
+
+1. Install with `cargo`:
+
+		$ cargo install --git https://github.com/teddywing/alias-auto-add.git --root /usr/local
+
+2. Add the program as a Mutt display filter. Add the following line to your
+   `.muttrc`, specifying the location of your Mutt aliases file as an argument
+   to `alias-auto-add`:
+
+		set display_filter = /usr/local/alias-auto-add ~/.mutt/aliases
+
+
+## Uninstall
+
+	$ cargo uninstall --root /usr/local alias-auto-add
+
+
+## License
+Copyright © 2016 Teddy Wing. Licensed under the GNU GPL (see the included
+COPYING file).
+
+
+[1]: https://github.com/teddywing/alias-auto-add/releases
+[2]: https://www.rust-lang.org/