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

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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 !