Add markdown extension to README so github can render it more nicely

Keep a link to the standard README file too.

Author: kodawah

README

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+README.md

README

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+Hedgewars - a turn based strategy game.
+=======================================
+
+Copyright 2004-2015 Andrey Korotaev <[email protected]> and others.
+See QTfrontend/res/html/about.html and CREDITS for a complete list of authors.
+
+Licence:
+--------
+Source code is distributed under the terms of the GNU General Public Licence
+version 2; images and sounds are distributed under the terms of the GNU Free
+Documentation Licence version 1.2. See the COPYING file for the full text of
+the licenses.
+
+Instructions:
+-------------
+See our wiki at: https://code.google.com/p/hedgewars/wiki/BuildingHedgewars
+
+You can find an outline of the necessary dependencies in the INSTALL file.
+
+Source code:
+------------
+Our main repository is located at http://hedgewars.googlecode.com using
+Mercurial as DVCS. A Git repository is also available (mirrored daily)
+at https://github.com/hedgewars/hw
+
+Contribute:
+-----------
+If you see a bug or have any suggestion please use the official bug tracker at
+http://code.google.com/p/hedgewars/issues/list or the integrated feedback
+button.
+
+If you want to help or get to know the sources better you can do that with some
+easy tasks from http://code.google.com/p/hedgewars/wiki/TODO. We also have an
+extended API in LUA to customize your adventures in our wiki at
+http://code.google.com/p/hedgewars/wiki/LuaAPI.
+
+If you know your way through the code feel free to send a patch or open a pull
+request. The best LUA scripts get released in the official DLC page and later
+integrated in the next version.
+
+Contact:
+--------
+* IRC channel     - irc://irc.freenode.net/hedgewars
+* community forum - http://www.hedgewars.org/forum
+* mailing list    - https://mail.gna.org/listinfo/hedgewars-dev
+