added docker

dockerfile

+# Use the official Node.js 18 image as a base
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package.json .
+COPY package-lock.json .
+
+# Install dependencies
+RUN npm install
+
+COPY . .
+
+
+RUN npm run build
+
+EXPOSE 3000
+
+# Command to run the Next.js application
+CMD ["npm", "start"]