Add Docker config file and documentation

Dockerfile

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+FROM ubuntu:14.04
+MAINTAINER Frederic Guillot <fred@kanboard.net>
+
+RUN apt-get update && apt-get install -y apache2 php5 php5-sqlite git && apt-get clean
+RUN echo "ServerName localhost" >> /etc/apache2/apache2.conf
+RUN cd /var/www && git clone https://github.com/fguillot/kanboard.git
+RUN rm -rf /var/www/html && mv /var/www/kanboard /var/www/html
+RUN chown -R www-data:www-data /var/www/html/data
+
+EXPOSE 80
+
+ENV APACHE_RUN_USER www-data
+ENV APACHE_RUN_GROUP www-data
+ENV APACHE_LOG_DIR /var/log/apache2
+ENV APACHE_LOCK_DIR /var/lock/apache2
+ENV APACHE_PID_FILE /var/run/apache2.pid
+
+CMD /usr/sbin/apache2ctl -D FOREGROUND