Added some documentation links for reference.

diff --git a/documents.txt b/documents.txt
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--- /dev/null
+++ b/documents.txt
@@ -0,0 +1,3 @@
+http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html
+ http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html
+ http://www.webweavertech.com/ovidiu/Objective-C/objc-features_3.html