add static_comments plugin

static_comments/Readme.md

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+Static comments
+---------------
+
+This plugin allows you to add static comments to an article. By default the
+plugin looks for the comments of each article in a local file named
+``comments/{slug}.md``, where ``{slug}`` is the value of the slug tag for the
+article. The comments file should be formatted using markdown.
+
+Set the ``STATIC_COMMENTS`` parameter to True to enable the plugin. Default is
+False.
+
+Set the ``STATIC_COMMENTS_DIR`` parameter to the directory where the comments
+are located. Default is ``comments``.
+
+On the template side, you just have to add a section for the comments to your
+``article.html``, as in this example::
+
+    {% if STATIC_COMMENTS %}
+    <section id="comments" class="body">
+    <h2>Comments!</h2>
+    {{ article.metadata.static_comments }}
+    </section>
+    {% endif %}
+
+Here is an example of usage:
+<http://jesrui.sdf-eu.org/pelican-static-comments.html>