code formatting in README

Author: gbaeke

README.md

@@ -1,17 +1,19 @@
 # iot-simulator
 IoT Simulator in Go
 
-Make a file called config.json and use the sample-config.json as a sample
+Make a file called  config.json and use the sample-config.json as a sample
 
-{
+`{
     "Interval":5,
     "IoTHubs":["gebahub.azure-devices.net","gebahub2.azure-devices.net"],
     "SasTokens":["SharedAccessSignature sr=...",
                  "SharedAccessSignature sr=..."],
     "DevGroups":[
         {"Prefix":"deva","DeviceNum":50,"Firmware":"1.0","IoTHub": 0},
         {"Prefix":"devb","DeviceNum":50,"Firmware":"1.1","IoTHub": 1}]
-}
+}`
+
+
 
 With the above config, there are two IoT Hubs each with its own SAS token (generate it with Device Explorer). The DevGroups control device creation. In the above case, 50 devices are created on IoT Hub 0 (gebahub) and 50 on IoT Hub 2 (gebahub2). The device names are prefix+device number.