adding badges to main readme page (#30)

- releases (links to release page)
- gitter (links to gitter community)
- license (links to license file)

README.md

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 # MQTT enabled CoDeSys 3 Home Automation
+<a href="https://github.com/MichielVanwelsenaere/HomeAutomation.CoDeSys3/releases" rel="nofollow"><img src="https://img.shields.io/github/release/MichielVanwelsenaere/HomeAutomation.CoDeSys3.svg" alt="Releases"></a>
+<a href="https://gitter.im/HomeAutomation-CoDeSys3/community?source=orgpage#" rel="nofollow"><img src="https://img.shields.io/gitter/room/HomeAutomation-CoDeSys3/community" alt="Gitter" ></a>
+<a href="./LICENSE" rel="nofollow"><img src="https://img.shields.io/github/license/MichielVanwelsenaere/HomeAutomation.CoDeSys3.svg" alt="License"></a>
+
 This CoDeSys 3.5 project is built for home automation purposes. The goal of the approach is to perform any critical operations like reading inputs, switching light, controlling sunscreens, etc. Inside the PLC itself and make use of MQTT events to send events to an MQTT broker. Using MQTT subscriptions it's possible to send commands to the PLC to switch outputs. 
 
 The purpose? Redundancy on a software level but also on a hardware level!