Added docker instructions

Docker

@@ -0,0 +1,21 @@
+# Use an official Node.js runtime as a parent image
+FROM node:18
+
+# Set the working directory in the container
+WORKDIR /usr/src/app
+
+# Copy the package.json and package-lock.json files to the container
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install --production
+
+# Copy the rest of the application code to the container
+COPY . .
+
+# Expose the port the app runs on
+EXPOSE 8080
+
+# Define the command to run the app
+CMD ["node", "app.js"]
+