add autoupdate script for server

update.sh

@@ -0,0 +1,13 @@
+BACKENDID = netstat -tulpn 2>/dev/null | grep ":3001 " | awk '{print $7;}' | cut -d "/" -f1
+kill -9 $BACKENDID
+git checkout master &&
+git pull &&
+cd backend
+npm i
+cd ../frontend
+npm i
+npm run build
+mv ./build/*
+../backend/frontend
+cd ../backend
+npm start