Added credits list

CREDITS.md

+    This is at least a partial credits-file of people that have
+    contributed to the current project. It is sorted by name and
+    formatted to allow easy grepping and beautification by
+    scripts. The fields are: name (N), email (E), web-address
+    (W) and description (D).
+    Thanks,
+
+            Avtandil Kikabidze
+----------
+
+N: Avtandil Kikabidze aka LONGMAN
+E: akalongman@gmail.com
+W: http://longman.ge
+D: Project owner, Maintainer
+
+N: Marco Boretto
+E: marco.bore@gmail.com
+D: Maintainer and Collaborator

README.md

@@ -214,7 +214,7 @@ $telegram->setLogPath($BOT_NAME.'.log');
 
 ```
 
-This code is available on [Github][0]. Pull requests are welcome.
+This code is available on [Github](https://github.com/akalongman/php-telegram-bot). Pull requests are welcome.
 
 
 ##Troubleshooting
@@ -229,7 +229,5 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for information.
 
 ## Credits
 
-Created by [Avtandil Kikabidze][1].
+Credit list in [CREDITS.md](CREDITS.md)
 
-[0]: https://github.com/akalongman/php-telegram-bot
-[1]: mailto:akalongman@gmail.com