Add Docker Compose stuff

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:15
+
+# Change working directory
+WORKDIR "/app"
+
+# Copy package.json and package-lock.json
+COPY package*.json ./
+
+# Install npm production packages 
+RUN npm install --production
+
+COPY . /app
+
+EXPOSE 3100
+
+USER node
+
+ENTRYPOINT ["npm", "start"]