Add Gateway build script.

Signed-off-by: tomoaki <tomoaki@tomy-tech.com>

MQTTSNGateway/build.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+if [ $# -eq 0 ]; then
+    echo "Usage: build.sh { udp | udp6 | xbee | loralink }"
+else
+    echo "Start building MQTT-SN Gateway"
+    
+    SCRIPT_DIR=$(cd $(dirname $0); pwd)
+    cd $SCRIPT_DIR/..
+    rm -rf build.gateway
+    mkdir build.gateway
+    cd build.gateway
+    cmake .. -DSENSORNET=$1
+    make MQTTSNPacke
+    make MQTT-SNGateway
+    make MQTT-SNLogmonitor
+fi