Modified README

README.md

@@ -20,4 +20,8 @@ Successfully run update package
 # Download Docker Desktop
 
 
+`docker ps`
+`docker image ls`
+`docker run -it ubuntu`
+
 

Dockerfile → hello-world/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:ubuntu
+FROM node:alpine
 COPY . /app
 WORKDIR /app
 CMD node app.js

hello-world/app.js

@@ -0,0 +1 @@
+console.log("Hello World!");