news: add note about news post procedure

templates/news/add.html

@@ -10,6 +10,16 @@ <h2>News: Edit Article</h2>
     {% else %}
     <h2>News: Add Article</h2>
     {% endif %}
+    <p>Every news post needs to have a corresponding draft <strong>submitted</strong> to
+    arch-dev-public and wait for feedback for at least 24 hours unless:</p>
+    <ol>
+      <li>It is urgent (and would be too late after 24 hours)</li>
+      <li>There are strong reasons for the team member posting the draft to
+	      believe that it should not be visible to the public before it is
+	      announced. In this second case, the draft should be submitted to
+      the staff@lists.archlinux.org mailing list instead.</li>
+    </ol>
+
     <p>News articles are formatted using
     <a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a>.
     Please use this syntax if at all possible over raw HTML, which can be used