added dockerfile

Dockerfile

@@ -0,0 +1,16 @@
+FROM node:10-alpine3.9 as npmpackages
+WORKDIR /app
+COPY package.json .
+RUN npm install
+
+FROM node:10-alpine3.9 as builder
+WORKDIR /app
+COPY --from=npmpackages /app /app
+COPY . .
+RUN npm run build
+
+FROM nginx:1.17.10-alpine
+RUN rm -r /usr/share/nginx/html/
+COPY --from=builder /app/_site/ /usr/share/nginx/html/
+
+EXPOSE 5000