update readme for chapter 11
imported chapter 12 code examples
imported chapter 13 sample code
imported chapter 15 example code
imported chapter 16 sample code
imported chapter 17 sample code
imported chapter 18 sample code
imported sample code for chapter 22
imported chapter 23 sample code
imported chapter 25 sample code
imported chapter 26 sample code
Merge pull request #1 from NTCoding/importingnickschapters

Importingnickschapters
replaced list with arrays an ienumerables for simplicity
uppercased commands and events namespaces for consistency
Merge pull request #2 from NTCoding/importingnickschapters

Importingnickschapters