Documentation update (#723)

-add JQJCY01YM
-add protocol add guidelines
-minor changes

docs/participate/adding-protocols.md

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+# Adding protocols
+
+Adding your device protocol to OpenMQTTGateway enable to increase interoperability and to create new use cases with your device. You will find below some guidance to do that. 
+
+## RF or IR
+For adding RF and IR propotocols to OpenMQTTGateway the best way is to do a pull request to [RCSwitch](https://github.com/1technophile/rc-switch), [Pilight](https://github.com/pilight/pilight) for RF and [IRRemoteESP8266](https://github.com/crankyoldgit/IRremoteESP8266) for IR.
+
+## BLE
+For BLE devices you can do a pull request directly to the [OpenMQTTGateway](https://github.com/1technophile/OpenMQTTGateway) repository.
+
+Currently we support the reading of advertizing BLE devices, advertizing means that the BLE device broadcast regularly its sensor data without the need of a BLE connection.
+