Added a readme with links to resources, explaining the facebook-error-codes

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+Resources for the Graph-API-Error-Codes:
+
+http://stackoverflow.com/questions/10478812/facebook-graph-api-error-code-list
+http://fbdevwiki.com/wiki/Error_codes
+https://developers.facebook.com/docs/graph-api/using-graph-api/#errors
+https://developers.facebook.com/docs/payments/reference/errorcodes