Add dockerfile and update gitignore

Dockerfile

@@ -0,0 +1,20 @@
+# Use an official Node.js runtime as a parent image
+FROM node:18-alpine
+
+# Set the working directory inside the container
+WORKDIR /usr/src/app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install any needed packages
+RUN npm install --production
+
+# Copy the rest of the application code to the container
+COPY . .
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Start the application
+CMD ["node", "server.js"]