Add start-broker script for windows

Signed-off-by: Daniel Dylag <bisker@op.pl>

Author: Bisk1

start-broker.bat

@@ -0,0 +1,10 @@
+@echo off
+rem Simplified Windows version of start-broker.sh
+rem Moquitto broker not supported, only Python Interopability Broker
+rem echo "Installing and starting Python Interop Broker."
+if not exist "paho.mqtt.testing" (
+	git clone https://github.com/eclipse/paho.mqtt.testing.git
+)
+copy "java_client_testing.conf" "paho.mqtt.testing/interoperability/java_client_testing.conf" /y
+cd paho.mqtt.testing/interoperability
+start python3 startbroker.py -c java_client_testing.conf