Merge pull request code100x#371 from rituraj00/main

updated docker-compose.yml file and adding instruction in README

Author: siinghd

README.md

@@ -13,6 +13,7 @@
    ```
 3. Run the following command to start the application:
    ```bash
+   docker create volume postgres-data # (optional) run this command if you face any mount volume / volume not exist error
    docker-compose up
    ```
 

docker-compose.yml

@@ -27,9 +27,12 @@ services:
     ports:
       - 5432:5432
     volumes:
-      - ./postgres-data:/var/lib/postgresql/data
+      - postgres-data:/var/lib/postgresql/data
     healthcheck:
       test: [ 'CMD-SHELL', 'pg_isready -d $${POSTGRES_DB} -U $${POSTGRES_USER}' ]
       interval: 10s
       timeout: 5s
       retries: 5
+
+volumes:
+  postgres-data: