Review of README, adding optional pgAdmin usage instructions

Author: leonardogdsilva

.gitignore

@@ -1,5 +1,6 @@
 .vscode
 .volumes
+extras/.volumes
 .env
 
 # compiled output

README.md

@@ -69,9 +69,26 @@ docker-compose up
 #### Application container
 
 ```bash
-docker exec -it nestjs-tasks bash
+docker exec -it taskmanagement_tasks bash
 ```
 
+#### Extras
+
+##### pgAdmin - PostgreSQL Tools
+
+Optionally, to use pgAdmin:
+
+- Run:
+
+```bash
+cd extras && docker-compose up
+```
+
+- Use your _browser_ and access [http://10.12.0.4](http://10.12.0.4)
+- Login as **leogomesdev@domain.com**, password **123456**
+- "Add New Server" using .env.example credentials
+- Enjoy it!
+
 ### Without Docker
 
 ```bash

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 services:
   node:
     image: node:14
-    container_name: nestjs-tasks
+    container_name: taskmanagement_tasks
     command: bash -c "npm install && npm run start"
     restart: always
     working_dir: '/app'
@@ -14,7 +14,7 @@ services:
 
   postgres:
     image: postgres:13
-    container_name: postgres
+    container_name: taskmanagement_postgres
     restart: always
     environment:
       - POSTGRES_USER=nestjstasks

extras/docker-compose.yml

@@ -0,0 +1,20 @@
+version: '2'
+
+services:
+  pgadmin:
+    image: dpage/pgadmin4:latest
+    container_name: taskmanagement_pgadmin
+    restart: always
+    environment:
+      - PGADMIN_DEFAULT_EMAIL=leogomesdev@domain.com
+      - PGADMIN_DEFAULT_PASSWORD=123456
+      - PGADMIN_CONFIG_CONSOLE_LOG_LEVEL=30
+    #volumes:
+    #  - ./volumes/pgadmin:/var/lib/pgadmin/
+    networks:
+      nestjstaskmanagement_nestkjs_tasks:
+        ipv4_address: 10.12.0.4
+
+networks:
+  nestjstaskmanagement_nestkjs_tasks:
+    external: true