Close #6658: Add CODE_OF_CONDUCT (#6661)

* Close #6658: Add CODE_OF_CONDUCT

* #6658 refine CoC

* Base on Django CoC: https://www.djangoproject.com/conduct/
* Simplify: we are a smaller project and can be more concise
* Add to ToC
* Link from README
* Link from index page

CODE_OF_CONDUCT

@@ -0,0 +1,76 @@
+Like the technical community as a whole, the Sphinx team and community is made
+up of volunteers from all over the world.
+Diversity is a strength, but it can also lead to communication issues and
+unhappiness. To that end, we have a few ground rules that we ask people to
+adhere to.
+
+* **Be friendly and patient.**
+
+* **Be welcoming.**
+  We strive to be a community that welcomes and supports people of all
+  backgrounds and identities. This includes, but is not limited to members of
+  any race, ethnicity, culture, national origin, colour, immigration status,
+  social and economic class, educational level, sex, sexual orientation, gender
+  identity and expression, age, size, family status, political belief, religion,
+  and mental and physical ability.
+
+* **Be considerate.**
+  Your work will be used by other people, and you in turn will depend on the
+  work of others. Any decision you take will affect users and colleagues, and
+  you should take those consequences into account when making decisions.
+  Remember that we're a world-wide community, so you might not be communicating
+  in someone else's primary language.
+
+* **Be respectful.**
+  Not all of us will agree all the time, but disagreement is no excuse for poor
+  behavior and poor manners. We might all experience some frustration now and
+  then, but we cannot allow that frustration to turn into a personal attack.
+  It’s important to remember that a community where people feel uncomfortable or
+  threatened is not a productive one. Members of the Sphinx community should be
+  respectful when dealing with other members as well as with people outside the
+  Sphinx community.
+
+* **Be careful in the words that you choose.**
+  We are a community of professionals, and we conduct ourselves professionally.
+  Be kind to others. Do not insult or put down other participants. Harassment
+  and other exclusionary behavior aren't acceptable. This includes, but is not
+  limited to:
+
+  * Violent threats or language directed against another person.
+
+  * Discriminatory jokes and language.
+
+  * Posting sexually explicit or violent material.
+
+  * Posting (or threatening to post) other people's personally identifying
+    information ("doxing").
+
+  * Personal insults, especially those using racist or sexist terms.
+
+  * Unwelcome sexual attention.
+
+  * Advocating for, or encouraging, any of the above behavior.
+
+  * Repeated harassment of others. In general, if someone asks you to stop, then
+    stop.
+
+* **When we disagree, try to understand why.**
+  Disagreements, both social and technical, happen all the time and Sphinx is no
+  exception. It is important that we resolve disagreements and differing views
+  constructively. Remember that we’re different. Different people have different
+  perspectives on issues. Being unable to understand why someone holds a
+  viewpoint doesn’t mean that they’re wrong. Don’t forget that it is human to
+  err and blaming each other doesn’t get us anywhere. Instead, focus on helping
+  to resolve issues and learning from mistakes.
+
+This isn’t an exhaustive list of things that you can’t do.
+Rather, take it in the spirit in which it’s intended - a guide to make it easier
+to enrich all of us and the technical communities in which we participate.
+This code of conduct applies to all spaces of the Sphinx community.
+
+Attribution
+-----------
+
+Original text courtesy of the Speak Up! project:
+http://web.archive.org/web/20141109123859/http://speakup.io/coc.html.
+

README.rst

@@ -90,6 +90,12 @@ Get in touch
 .. _on GitHub: https://github.com/sphinx-doc/sphinx
 .. _mailing list: https://groups.google.com/forum/#!forum/sphinx-users
 
+Please adhere to our `code of conduct`__.
+
+__ http://www.sphinx-doc.org/en/master/code_of_conduct.html
+
+__
+
 Testing
 =======
 

doc/_templates/index.html

@@ -120,4 +120,8 @@
       <li>{%trans path=pathto("authors")%}<a href="{{ path }}">Sphinx Authors</a></li>{%endtrans%}
     </ul>
 
+    <h2>{%trans%}Code of Conduct{%endtrans%}</h2>
+
+    {%trans path=pathto("code_of_conduct")%}Please adhere to our <a href="{{ path }}">Code of Conduct</a>.{%endtrans%}
+
 {% endblock %}

doc/code_of_conduct.rst

@@ -0,0 +1,8 @@
+:tocdepth: 2
+
+.. _code_of_conduct:
+
+Sphinx Code of Conduct
+======================
+
+.. include:: ../CODE_OF_CONDUCT

doc/contents.rst

@@ -34,6 +34,7 @@ Sphinx documentation contents
    changes
    examples
    authors
+   code_of_conduct