Added Dockerfile to containerized the application

Dockerfile

@@ -0,0 +1,34 @@
+# Stage 1: Build the app
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Copy only package files first for caching
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the source code
+COPY . .
+
+# Build the production static files
+RUN npm run build
+
+
+# Stage 2: Run the built app using a minimal Node image
+FROM node:18-alpine AS runner
+
+# Install serve globally
+RUN npm install -g serve
+
+# Create working directory
+WORKDIR /app
+
+# Copy only the built static files from builder stage
+COPY --from=builder /app/build ./build
+
+# Serve the static files
+CMD ["serve", "-s", "build", "-l", "3000"]
+
+EXPOSE 3000

README.md

@@ -21,7 +21,7 @@ See the live project in action: https://react-js-simple-calculator.netlify.app/
 - HTML
 - CSS
 - JS
-
+- Docker
 ## Getting Started
 
 To get a local copy up and running, follow these steps:
@@ -31,6 +31,22 @@ To get a local copy up and running, follow these steps:
 3. Install dependencies: `npm install`
 4. Start the development server: `npm start`
 
+## You Can Run Project directly in using Docker(ubuntu os)
+
+1. Install Docker in ubuntu operating system
+   - update o.s i.e. sudo apt-get update --y
+   - install docker i.e. sudo apt-get install docker.io
+2. Give permissions to access docker images and containers without sudo user
+   - sudo useradd -aG docker $USER
+   - sudo chmod 666 /var/run/docker.sock
+3. Build the docker image using below command
+   - docker build -t calapp .
+4. Run the docker container using below command
+   - docker run -itd -p 3000:3000 --name=calapp calapp
+5. Check the containers are up or not
+   - docker ps   
+6. Access Your application on 3000 port.
+
 ## Usage
 
 1. Click the buttons to input numbers and operators.