add dockerfile

.dockerignore

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+node_modules
+build
+.git
+.gitignore
+README.md
+!index.html

Dockerfile

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+# Stage 1: Build the React application
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve the application with Nginx
+FROM nginx:1.25-alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]