README.md changed

README.md

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-Croogo plugin of Amazon S3
+Croogo plugin of Amazon S3 and local storages
+
+Usage:
+1. Clone git repo to your Croogo plugins dir
+2. Install Plugin as standard procedure
+3. Provide in Service configuration part Amazon public code, secure code and desired 
+  bucket name (bucket exists not required)
+4. Go to "Extensions" -> "Media Storages" -> "AWS S3"
+5. Voila! Your bucket created(if not created before) and your can upload images and other 
+  media to your Amazon S3 storage service.
+
+Thanks to Croogo developer fahad19(http://croogo.org) and primeminister(https://github.com/primeminister/CakePHP-Amazon-S3-plugin) for ideas