add npm command

README.md

@@ -2,10 +2,20 @@
 
 ```docker
 docker-compose up -d --build
+```
 
 OR
 
 <!-- if running as basic container, uncomment the dotenv line in server.js -->
+
+```docker
 docker build -t unit-tracker-api .
 docker run -p 4000:4000 unit-tracker-api
 ```
+
+OR
+
+```bash
+npm install
+npm start
+```