Added simple executable for rendering rst files.

README.rst

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+Restructured text renderer for Gitea
+====================================
+
+This is simple custom rst2html5 renderer for `Gitea`_.
+
+Installation
+------------
+
+Before starting deployment of Gitea using docker or docker-compose, you'll
+need to create an altered image which would contain `docutils`_ python package.
+There is a simple Dockerfile attached, which can be adjusted to your needs
+(i.e. it might be needed to pin to stable version of gitea), than let's assume,
+that we tag the image with ``:rst``:
+
+.. code:: shell
+
+   $ docker build -t gitea:rst -f Dockerfile .
+
+Procedure of running dockerized deployment is `same as documented`_.
+
+Now, as you have it up and running, there is still a need for altering
+configuration. Stop the container, and alter file
+``path-to/gitea/conf/app.ini``, and add external renderer section:
+
+.. code:: ini
+
+   [markup.restructuredtext]
+   ENABLED = true
+   FILE_EXTENSIONS = .rst
+   RENDER_COMMAND = "rst2htmlbody"
+   IS_INPUT_FILE = false
+
+
+And that's it!
+
+Unfortunately, you'll need to repeat those steps every time you'd like to
+update gitea.
+
+
+.. _docutils: https://docutils.sourceforge.io
+.. _gitea: https://gitea.io
+.. _same as documented: https://docs.gitea.io/en-us/install-with-docker/