Create README.md

README.md

+# Airtime
+PHP API for Mobile phone TOPUP
+[![N|Solid](https://www.camoo.cm/img/icon/camoo_logo_thom1.png)](https://www.camoo.cm/)
+
+PHP TOPUP API via the **_CAMOO AIRTIME gateway_**
+
+Requirement
+-----------
+
+This library needs minimum requirement for doing well on run.
+
+   - [Sign up](https://www.camoo.cm/join) for a free CAMOO account
+   - Ask CAMOO Team for new access_key for developers
+   - CAMOO TOPUP API client for PHP requires version 5.5.x and above