Add the papers for reading

Reference

• http://the-paper-trail.org/blog/distributed-systems-theory-for-the-distributed-systems-engineer/
• http://dancres.github.io/Pages/
• http://www.quora.com/What-are-the-seminal-papers-in-distributed-systems-Why
• http://christophermeiklejohn.com/distributed/systems/2013/07/12/readings-in-distributed-systems.html
• https://courses.engr.illinois.edu/cs525/sp2011/sched.htm