[libdfp-patches] Libdfp DCO requirement, i.e. signed-off

[Ryan Arnold <rsa@xxxxxxxxxx>]

As a requirement of my maintainership of Libdfp I'm adding the following
requirement for contributions.  It boils down to a signed-off statement.

---------------------------------------------------------------------------
--- CONTRIBUTORS	(revision 12081)
+++ CONTRIBUTORS	(revision 12082)
@@ -18,3 +18,44 @@
 	Joseph Kerian <kerian@xxxxxxxxxx>
 	Andreas Krebbel <krebbel@xxxxxxxxxxxxxxxxxx>
 	Carlos Eduardo Seo <cseo@xxxxxxxxxxxxxxxxxx>
+	Luis Machado <luisgpm@xxxxxxxxxx>
+
+Process For Accepting Third Party Code Contributions:
+
+To improve tracking of contributions to this project we will use a process
+modeled on the modified Developers Certificate of Origin (DCO 1.1) and use a
+"sign-off" procedure on patches that are being emailed around or contributed
+in any other way.
+
+The sign-off is a simple line at the end of the explanation for the patch,
+which certifies that you wrote it or otherwise have the right to pass it on as
+an open-source patch.  The rules are pretty simple: if you can certify the
+below:
+
+By making a contribution to this project, I certify that:
+
+(a)The contribution was created in whole or in part by me and I have the right
+to submit it under the open source license indicated in the file; or
+
+(b)The contribution is based upon previous work that, to the best of my
+knowledge, is covered under an appropriate open source License and I have the
+right under that license to submit that work with modifications, whether
+created in whole or in part by me, under the same open source license (unless
+I am permitted to submit under a different license), as indicated in the file;
+or
+
+(c)The contribution was provided directly to me by some other person who
+certified (a), (b) or (c) and I have not modified it.
+
+(d)The contribution is made free of any other party's intellectual property
+claims or rights.
+
+(e)I understand and agree that this project and the contribution are public
+and that a record of the contribution (including all personal information I
+submit with it, including my sign-off) is maintained indefinitely and may be
+redistributed consistent with this project or the open source license(s)
+involved.
+
+Then you just add a line saying:
+
+Signed-off-by: Random J Developer random@xxxxxxxxxxxxx>