Document how to import posts from Medium (#3262)

docs/importer.rst

@@ -26,6 +26,12 @@ not be converted (as Pelican also supports Markdown).
    manually, or use a plugin such as `More Categories`_ that enables multiple
    categories per article.
 
+.. note::
+
+   Imported pages may contain links to images that still point to the original site.
+   So you might want to download those images into your local content and manually
+   re-link them from the relevant pages of your site.
+
 Dependencies
 ============
 
@@ -121,6 +127,15 @@ For WordPress::
 
     $ pelican-import --wpfile -o ~/output ~/posts.xml
 
+For Medium (an example of using an RSS feed):
+
+    $ python -m pip install feedparser
+    $ pelican-import --feed https://medium.com/feed/@username
+
+.. note::
+
+   The RSS feed may only return the most recent posts — not all of them.
+
 Tests
 =====