adds docker files and README

Author: RicardoVeronica

Dockerfile

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+FROM postgres:9.6-alpine
+
+WORKDIR ./code
+
+COPY . .

README.md

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+# Docker and Postgres
+
+
+## Pull the image
+    $ docker pull ricardoveronica/postgres-pgadmin:tagname
+
+#### Before starting
+Go to, docker-compose.yml and put your own data in services
+For db:
+* POSTGRES_DB
+* POSTGRES_USER
+* POSTGRES_PASSWORD
+For pgadmin:
+* PGADMIN_DEFAULT_EMAIL
+* PGADMIN_DEFAULT_PASSWORD
+
+### Run
+    $ docker-compose up
+    # For detached mode
+    $ docker-compose up -d
+
+### Start Postgres
+    $ docker-compose exec db psql -U your_user your_db
+
+### Go to your browser for start PGAdmin
+0.0.0.0:16543
+
+### Create a /code directory if you want to import .sql files from psql
+    \i code/code/your.sql

docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    build: .
+    environment:
+      - POSTGRES_DB=mydb
+      - POSTGRES_USER=user
+      - POSTGRES_PASSWORD=SuperSecret
+    volumes:
+      - ./pgdata:/var/lib/postgresql/data
+    ports:
+      - 5432:5432
+    networks:
+      - postgres-network
+
+  pgadmin:
+    image: dpage/pgadmin4
+    environment:
+      - [email protected]
+      - PGADMIN_DEFAULT_PASSWORD=SuperSecret
+    ports:
+      - 16543:80
+    depends_on:
+      - db
+    networks:
+      - postgres-network
+
+networks:
+  postgres-network:
+    driver: bridge