Add proxy directory with sample proxy pattern code
(maint) Write more detailed readme and add use case

Prior to this commit, the readme didn't have much information. This
commit adds more information about the design pattern and also adds a
developer API use case.
Update readme about api example
Merge pull request #2 from Whopper92/proxy_pattern

Add proxy directory with sample proxy pattern code
Merge pull request #3 from briancain/maint/master/finalize_strategy

Maint/master/finalize strategy