[iphone] README added with steps to include ZXingWidget into your project

git-svn-id: http://zxing.googlecode.com/svn/trunk@1408 59b500cc-1b3d-0410-9834-0bbf25fbcc57

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+Zxing for iphone is a sub-project of zxing project partially maintened by 
+independent developers. As of 2nd of June 2010, it contains 3 iPhone projects:
+  - BarCodes: Original zxing iPhone app. Available on app store. However, the code is cirrently maintained
+  - ZXingWidget: a Library that can be included in any iPhone app
+  - ScanTest: a simple test app for ZXingWidget
+
+
+How to include ZXingWidget in a easy and clean way:
+====================================================
+
+  1. Locate the "ZXingWidget.xcodeproj" file under "`zxing/iphone/ZXingWidget/`". Drag ZXingWidget.xcodeproj and
+     drop it onto the root of your Xcode project's "Groups and Files"  sidebar.  A dialog will
+     appear -- make sure "Copy items" is unchecked and "Reference Type" is "Relative to Project"
+     before clicking "Add".    
+   
+  2. Now you need to link the ZXingWidget static library to your project.  Click the "ZXingWidget.xcodeproj" 
+        item that has just been added to the sidebar.  Under the "Details" table, you will see a single
+        item: ZXingWidget.a.  Check the checkbox on the far right of ZXingWidget.a.
+  
+  3. Now you need to add ZXingWidget as a dependency of your project, so Xcode compiles it whenever
+        you compile your project.  Expand the "Targets" section of the sidebar and double-click your
+        application's target.  Under the "General" tab you will see a "Direct Dependencies" section. 
+        Click the "+" button, select "ZXingWidget", and click "Add Target"
+  
+  4. Finally, we need to tell your project where to find the ZXingWidget headers.  Open your
+        "Project Settings" and go to the "Build" tab. Look for "Header Search Paths" and double-click
+        it.  Add the relative path from your project's directory to the
+        "zxing/iphone/ZXingWidget/Classes" directory. Make sure you click the checkbox "relative path" !
+ 
+  5. You're ready to go. Just #import <ZXingWidgetController.h> from anywhere and it should work !
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