添加yarn iinstall

Author: myfreax

README.md

@@ -6,7 +6,7 @@
 - [ ] Nginx
 - [ ] Nodemon
 
-## Software
+## Software Stack
 - MongoDB
 - Redis
 - MySQL
@@ -30,6 +30,8 @@ cd docker-node.js
 
 docker-compose up -d
 
+yarn install
+
 ```
 
 Now,you can open http://127.0.0.1:3000/ in browser