Create Portugal collaboration contributor documentation

[nagcas]

Overview

Create documentation for external contributors collaborating on Portuguese seismic integration.

Includes

• Development setup
• Architecture overview
• Coding standards
• API guidelines
• Testing process

Goal

Make collaboration easier and maintain project quality.

[michelmelo]

hi @nagcas I created this document based on what I read in the code. Check if it's correct and if any adjustments are needed.

GUIA-INTEGRAR-IPMA-PORTUGAL.md