Add a README.md to keep things pretty on GitHub

Author: geofft

README.md

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+config-package-dev
+===
+
+config-package-dev is a tool for building Debian _configuration
+packages_, that is, packages that configure other Debian packages
+already on your system. It is an alternative to configuration-management
+tools (e.g., Ansible, Chef, Puppet, cfengine) that integrates cleanly
+with the Debian packaging system: you can apply configuration by
+installing a configuration package, and remove it cleanly by
+uninstalling it. config-package-dev uses `dpkg-divert` to inform the
+packaging system that it is changing files owned by another package,
+which means that your changes remain applied even when the original
+package is upgraded.
+
+Configuration packages are particularly useful for sites using Debian or
+Ubuntu (or another dpkg-based distribution) and are already running
+their own interrnal apt repository. You can provide site defaults and
+configuration through your existing package-update processes, and make
+sure systems are up-to-date in both software and configuration by
+checking what versions of packages they have installed.
+(config-package-dev is not intended for use by packages in Debian
+itself.)
+
+config-package-dev is a project of [MIT SIPB](https://sipb.mit.edu/),
+and was originally developed for the
+[Debathena](https://debathena.mit.edu) project to provide functionality
+to access MIT computing services (e.g., Kerberos and AFS configuration)
+on privately owned machines.
+
+To get started, install `config-package-dev` from your package manager;
+we support the versions in the Debian and Ubuntu archives. Take a look
+at the [examples](examples/debhelper), or check out the full
+documentation at
+[https://debathena.mit.edu/config-package-dev](https://debathena.mit.edu/config-package-dev). 
+If you're using config-package-dev, please also join the
+[config-package-dev@mit.edu mailing
+list](https://mailman.mit.edu/mailman/listinfo/config-package-dev).
+
+config-package-dev itself is [licensed under the
+GPLv2+](debian/copyright), but the code it
+adds to configuration packages is [released under the MIT
+license](https://github.com/sipb/config-package-dev/commit/8d36c7611f0b3f3a16447b613d0e2a6ad0b1059f#diff-e93fa5c394e60f185a53f9ff00b68eb2)
+and automatically includes the MIT license in the added code.
+
+Feel free to report bugs or submit patches either on GitHub or [on the Debian
+bug tracker](https://bugs.debian.org/src:config-package-dev).
+
+[![Build Status](https://travis-ci.org/sipb/config-package-dev.svg?branch=master)](https://travis-ci.org/sipb/config-package-dev)