Add the doc

doc/usecases.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+typ=$1
+
+#0:stop all
+#1:start use cases
+#2:restart gateway
+
+if [ "$typ" = "0" ];then
+    killall usecases_proxy
+    killall lora_pkt_fwd
+    killall process.sh
+elif [ "$typ" = "1" ];then
+    /gateway/usecases_proxy -d Gateway &
+elif [ "$typ" = "2" ];then
+    killall lora_pkt_fwd
+    killall process.sh
+    sh /gateway/start.sh
+fi
+
+