update administrivia docs

Signed-off-by: Sean Whitton <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,4 +10,4 @@ Instead, either
   using git-request-pull(1)
 
 - prepare patches with git-format-patch(1), and send them to
-  <[email protected]>, possibly using git-send-email(1)
+  <[email protected]>, probably using git-send-email(1)

CONTRIBUTING.rst

@@ -0,0 +1,40 @@
+Submitting patches
+==================
+
+Thank you for your interest in contributing to this project!
+
+Please **do not** submit a pull request on GitHub.  The repository
+there is an automated mirror, and I don't develop using GitHub's
+platform.
+
+Instead, either
+
+- publish a branch somewhere (a GitHub fork is fine), and e-mail
+  <[email protected]> asking me to merge your branch, possibly
+  using git-request-pull(1)
+
+- prepare patches with git-format-patch(1), and send them to
+  <[email protected]>, probably using git-send-email(1)
+
+Reporting bugs
+==============
+
+By e-mail to <[email protected]>.
+
+Please read "How to Report Bugs Effectively" to ensure your bug report
+constitutes a useful contribution to the project:
+<https://www.chiark.greenend.org.uk/~sgtatham/bugs.html>
+
+Signing off your commits
+========================
+
+Contributions are accepted upstream under the terms set out in the
+file ``LICENSE``.  You must certify the contents of the file
+``DEVELOPER-CERTIFICATE`` for your contribution.  To do this, append a
+``Signed-off-by`` line to end of your commit message.  An easy way to
+add this line is to pass the ``-s`` option to git-commit(1).  Here is
+an example of a ``Signed-off-by`` line:
+
+::
+
+    Signed-off-by: Sean Whitton <[email protected]>

DEVELOPER-CERTIFICATE

@@ -0,0 +1,37 @@
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+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) 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.

debian/changelog

@@ -1,6 +1,8 @@
 pandoc-citeproc-preamble (1.4) UNRELEASED; urgency=medium
 
   * Update copyright years in various places.
+  * Add CONTRIBUTING.rst & DEVELOPER-CERTIFICATE.
+  * Tweak GitHub pull request template.
 
  -- Sean Whitton <[email protected]>  Fri, 29 Nov 2019 14:26:39 -0700