[searchisko-dev] [doc] Tutorial section added.

Hi, I added Tutorial section into Searchisko documentation: https://github.com/searchisko/searchisko/blob/master/documentation/tutori... The first tutorial is getting started for new Content Providers: https://github.com/searchisko/searchisko/blob/master/documentation/tutori... Still, it might be too high-level, feel free to let me know if any topic needs further explanation. Regards, Lukas Vlcek jboss.org Development Team