add docker support

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package.json ./
+COPY package-lock.json ./
+RUN npm install
+
+COPY . .
+
+RUN npm run build
+
+EXPOSE 7000
+
+CMD ["npm", "run", "start", "--port", "7000"]