Update README.md

Author: JoeOster

Tools/IoTConnectionTools/ibm-device/README.md

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 | Software                          | Paho MQTT C library, OpenSSL development package
 | What you will learn               | Use protocol MQTT to send events from a device
 
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 ## Purpose
 This is a simple sample you could use for a test of IBM device connection. This project shows how-to develop a device code using Watson IoT Platform iot-c device client library, connect and interact with Watson IoT Platform Service.