Added README

README.md

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+
+# Pleroma Comments
+
+**Pleroma Comments** is a Pandoc filter that generates a comments section by fetching replies from the Fediverse (through Pleroma servers). 
+
+Example: [https://antares.neocities.org/blog/pandoc-filter-pleroma-comments](https://antares.neocities.org/blog/pandoc-filter-pleroma-comments)
+
+## Variables
+
+The filter uses the variable `pleroma-urls` for input which can be defined in the manuscript's YAML header.
+
+* `pleroma-urls`: a list of strings that should contain the URLs of the posts to source replies from.
+
+The filter exports variables that can be used in a pandoc template.
+
+* `pleroma-comments`: string, the full comments section rendered by the script.
+* `pleroma-comments-count`: integer, the number of comments received by the script.
+* `pleroma-has-comments`: boolean, whether or not there are comments available
+* `pleroma`: table of strings, post IDs and their full URLs.
+
+## Usage
+
+In a Pandoc template, include the following to generate the entire comments section.
+
+    $if(pleroma-urls)$
+    <hr/>
+    <h2 id="comments">Comments ($pleroma-comments-count$)</h2>
+    <p>Reply to any of the bulleted links to leave a comment.</p>
+    <ul>
+        $for(pleroma)$
+        <li><a href="$pleroma.link$">$pleroma.id$</a></li>
+        $endfor$
+    </ul>
+    $pleroma-comments$
+    $endif$
+
+Add a link to jump to the comments section if there are any comments.
+
+    $if(pleroma-has-comments)$
+    <a href="#comments">View $pleroma-comments-count$ comment(s).</a>
+    $endif$