add installation via docker

Dockerfile

@@ -1,11 +1,11 @@
 FROM node:18.17.1-alpine
 WORKDIR /app
-COPY package*.json .
+COPY package*.json ./
 RUN npm install
-COPY . .
+COPY . ./
 EXPOSE 3001
 EXPOSE 3000
 RUN npx prisma generate
 RUN npm install -g nodemon
 RUN chmod +x ./startserver.sh
-CMD ["npm", "run","dev"]
+CMD ["sh","./startserver.sh"]

README.md

@@ -25,5 +25,21 @@ npm run dev
 ```
 ***Make sure you have your database running before staring the server***
 
+### Using docker
+
+Below is example how you can use docker with database within same network:
+Set DATABASE_URL environment variable within .env file as below: 
+`DATABASE_URL=postgresql://postgres:<POSTGRES_PASSWORD>@roommates:5432/roommates`
+*** You can skip setting up docker network postgresql container if you are using external databse***
+```bash
+sudo docker run -d \
+        --name roommates \
+        -e POSTGRES_PASSWORD=PASSWORD \
+        -e PGDATA=/var/lib/postgresql/data/pgdata \
+        -v ~/.docker/volumes/postgres:/var/lib/postgresql/data \
+        -p 5432:5432 --network roommates_network postgres
+
+docker run -p 3000:3000 --network roommates_network --env-file ./.env sandeshkhadka/roommates-backend:latest
+```
 ## Docs: Refer to [wiki](https://github.com/sandeshkhadka/RooMates-backend/wiki) for documentation on api and routes