Added IoT description

README.md

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+[Internet of things](https://en.wikipedia.org/wiki/Internet_of_things) describes physical objects with sensors, processing ability, software, and other technologies that connect and exchange data with other devicesover the Internet.
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 - [DeviceHive](https://www.devicehive.com/) - Open Source IoT Platform with a wide range of integration options. ([Demo](https://playground.devicehive.com/), [Source Code](https://github.com/devicehive/devicehive-java-server)) `Apache-2.0` `Java`
 - [Domoticz](https://www.domoticz.com/) - Home Automation System that lets you monitor and configure various devices like: Lights, Switches, various sensors/meters like Temperature, Rain, Wind, UV, Electra, Gas, Water and much more. ([Source Code](https://github.com/domoticz/domoticz), [Clients](https://github.com/domoticz/domoticz-android)) `GPL-3.0` `C/C++`
 - [FHEM](https://fhem.de/fhem.html) - FHEM is used to automate common tasks in the household like switching lamps and heating. It can also be used to log events like temperature or power consumption. You can control it via web or smartphone frontends, telnet or TCP/IP directly. ([Source Code](https://svn.fhem.de/trac)) `GPL-3.0` `Perl`