add docker compose

[Passossss]

Criação do Docker Compose para execução do banco de dados local concluída.
Realizados testes para validação do funcionamento.
As imagens seguem abaixo.

O setup permite rodar o banco localmente de forma rápida e simples, facilitando testes, ajustes e desenvolvimento.

[Copilot]

Pull Request Overview

This PR adds Docker Compose configuration to enable local PostgreSQL database setup for the Fin backend application. The setup includes container configuration, documentation, and instructions for running the database locally to facilitate development and testing.

• Added Docker Compose file with PostgreSQL 16 configuration
• Created comprehensive documentation with setup instructions
• Included connection string examples and Entity Framework migration commands

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
docker-compose.yml	Defines PostgreSQL service with health checks and volume persistence
docker.md	Provides step-by-step setup instructions and configuration examples

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[Copilot]

The word 'verificar' should be capitalized to maintain consistency with other section headers in the document.

Suggested change

	**verificar**
	**Verificar**

[Copilot]

Missing accent in 'já' and 'variáveis'. Should be 'se já possui o banco utilize suas variáveis de ambiente em um .env'.

Suggested change

	**se ja possui o banco utilize suas variaveis de ambiente em um .env**
	**se já possui o banco utilize suas variáveis de ambiente em um .env**

[Copilot]

This section is incomplete and unclear. The content inside the code block appears to be incomplete Portuguese text rather than actual code or configuration examples. Consider completing this section with proper .env file examples or removing the incomplete code block.

Suggested change

	tem modelo de exemplo .env.example
	usar ou alterar para apenas .env
	como esta localmente pode utilizar
	# Exemplo de arquivo .env
	POSTGRES_HOST=localhost
	POSTGRES_PORT=5432
	POSTGRES_DB=fin_app
	POSTGRES_USER=fin_app
	POSTGRES_PASSWORD=fin_app