Added readme

Readme.md

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+DokuWiki docker container
+=========================
+
+
+To run image:
+-------------
+
+docker run -d -p 80:80 --name my_wiki mprasil/dokuwiki 
+
+You can now visit the install page to configure your new DokuWiki wiki.
+
+For example, if you are running container locally, you can acces the page 
+in browser by going to http://127.0.0.1/install.php
+
+Build your own
+--------------
+
+docker build -t my_dokuwiki .