Initial MQTT folder README

Author: sandeepmistry

mqtt/README.md

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+# Using MQTT with the Arduino WiFi Shield 101 and Arduino Cloud
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+This series of example is based on [pubsubclient](https://github.com/knolleary/pubsubclient) Arduino Client for MQTT library by Nick O'Leary ([@knolleary](https://github.com/knolleary)).
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+It also includes a Web UI example to visualize and send messages.