importer - add documentation

docs/importer.rst

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+=================================
+ Import from other blog software
+=================================
+
+Description
+===========
+
+``importer.py`` is a command line tool for converting articles from other
+software to ReStructuredText. The supported formats are:
+
+- Wordpress XML export
+- Dotclear export
+- RSS/ATOM feed
+
+The conversion from HTML to ReStructuredText relies on `pandoc
+<http://johnmacfarlane.net/pandoc/>`_. For Dotclear, if the source posts are
+written with Markdown syntax, they will not be converted (as Pelican also
+supports Markdown).
+
+Usage
+"""""
+
+| importer.py [-h] [--wpfile] [--dotclear] [--feed] [-o OUTPUT]
+|                    [--dir-cat]
+|                    input
+
+Optional arguments:
+"""""""""""""""""""
+
+  -h, --help            show this help message and exit
+  --wpfile              Wordpress XML export
+  --dotclear            Dotclear export
+  --feed                Feed to parse
+  -o OUTPUT, --output OUTPUT
+                        Output path
+  --dir-cat             Put files in directories with categories name
+
+Examples
+========
+
+for Wordpress::
+
+    $ python2 tools/importer.py --wpfile -o ~/output ~/posts.xml
+
+for Dotclear::
+
+    $ python2 tools/importer.py --dotclear -o ~/output ~/backup.txt
+
+
+Tests
+=====
+
+To test the module, one can use sample files:
+
+- for Wordpress: http://wpcandy.com/made/the-sample-post-collection
+- for Dotclear: http://themes.dotaddict.org/files/public/downloads/lorem-backup.txt