README: add sales pitch and usage instructions

To avoid licensing issues with this README file itself, I'm releasing
it under the Creative Commons CC0 1.0 Universal license (see the
`license` branch for full text).

Signed-off-by: W. Trevor King <wking@tremily.us>

diff --git a/README b/README
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+Do you want explicit licensing and publishing permissions for each
+patch you incorperate into your project?  Do you miss the simplicity
+of Signed-off-by tags you use when developing the Linux kernel and
+Git?  This repository extracts the Developer Certificate of Origin and
+Signed-off-by documentation from both projects, and presents them in a
+project-agnostic manner.  To incorporate into your own project,
+
+1. Merge the documentation into your project:
+
+    $ git remote add s-o-b git://tremily.us/signed-off-by.git
+    $ git merge s-o-b/signed-off-by
+
+2. Tell your developers by pointing to
+   `Documentation/SubmittingPatches` from your `README` or
+   `CONTRIBUTING` documentation and sending a message to your mailing
+   list.
+
+3. Prosper.