SDL Manual: Reviewers Needed

Work has begun on the 4th chapter of the SDL Manual. The code is on github, and I regularly update the pdf on our server.

Writing manuals is not of my greatest skills, so I would love some review of my work. Any problems can be reported in the issues.

If you want to help with writing the manual, please join me on #sdl irc.perl.org or email us at
sdl-devel@perl.org

--yapgh