ADD: Documentation

Author: PascalCorpsman

TCP_IP/MQTT_Broker/Readme.md

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+# MQTT broker
+
+This application is a MQTT Broker (server on which the devices can connect to)
+
+![](preview.png)
+
+The goal of this application is not to provide a fully functional MQTT Broker, but instead give a easy access to a eventhandler that can be used to include MQTT devices into your own application.
+
+# Features
+- Connect (unencrypted)
+- Subscribe
+- Unsubscribe
+- Publish
+- Ping
+
+Each of these packages will be received and correct (no warranties) responded. Some of the packages need answers during callback calls (see source code for that).
+
+There is no routing, or other wildcard features implemented. This is all up to you.
+
+# Use cases
+- debugging of MQTT Connections
+- endpoint for MQTT devices 
+