main: created docker files

Dockerfile

@@ -0,0 +1,7 @@
+FROM node:14-alpine
+WORKDIR /remnantchat/
+COPY package*.json ./
+RUN npm install
+COPY . .
+EXPOSE 3000
+CMD ["npm", "start"]

docker-compose.yml

@@ -0,0 +1,10 @@
+version: '3'
+services:
+  remnantchat:
+    build: .
+    ports:
+      - '3000:3000'
+    volumes:
+      - '.:/remnantchat/'
+    environment:
+      - NODE_ENV=production