Prepare simple pages

[jandudek-gdc]

• convert the Jadler documentation (from the Jadler class) from Czenglish to proper English.
• the landing page of jadler.net should display this documentation
• prepare simple wiki pages for changelog, roadmap and jadler inclusion (maven, downloadable jars)
• rework the landing page, add 'how to add' section (with mockito and junit proper maven dependencies)
• deploy somewhere the documentation from the net.jadler.Jadler class and add a better formatting than provided by Javadoc. (ideally add the formatting straight to the javadoc if possible)

[rdp]

github README?