[ADD] Docker setup

Author: stivenramireza

.env.template

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+DB_HOST=
+DB_PORT=
+DB_NAME=
+DB_USER=
+DB_PASSWORD=

.gitignore

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+# Code editor
+.vscode
+
+# Environment variables
+.env

docker-compose.yml

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+version: '3.1'
+
+services:
+  postgres-db:
+    container_name: postgres-db
+    image: postgres:15.3
+    ports:
+      - ${DB_PORT}:${DB_PORT}
+    networks:
+      - postgres
+    volumes:
+      - postgres-db-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: ${DB_NAME}
+      POSTGRES_USER: ${DB_USER}
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+
+networks:
+  postgres:
+
+volumes:
+  postgres-db-data: