Added MQTT and Datadump example config

.gitignore

@@ -16,3 +16,5 @@ ssdv
 gateway-mode0.txt
 test.txt
 uplink.txt
+LORA_dump
+LORA_Dump

gateway-sample.txt

@@ -59,3 +59,16 @@ AFC_1=Y
 #DIO5_1=5
 #UplinkTime_1=5
 #UplinkCycle_1=60
+
+# MQTT Config
+EnableMQTT=Y
+MQTTHost=mqtt_host
+MQTTPort=1883
+MQTTUser=mqtt_user
+MQTTPass=mqtt_password
+MQTTClient=mqtt_client_name
+MQTTTopic=topic_name
+
+# Dump config
+#DumpBuffer=Y
+#DumpFile=./LORA_dump