added podspec

Author: matsu911

JSONKit.podspec

@@ -0,0 +1,11 @@
+Pod::Spec.new do |s|
+  s.name     = 'JSONKit'
+  s.version  = 'master'
+  s.license  = 'BSD / Apache License, Version 2.0'
+  s.summary  = 'A Very High Performance Objective-C JSON Library.'
+  s.homepage = 'https://github.com/johnezang/JSONKit'
+  s.author   = 'John Engelhart'
+  s.source   = { :git => 'https://github.com/johnezang/JSONKit.git' }
+
+  s.source_files   = 'JSONKit.[mh]'
+end