mohammed firdous

PipeCD - Plugin Contribution Guide

Created comprehensive guide for contributing to PipeCD's plugin ecosystem, documenting architecture patterns and development best practices.

I wrote and merged PipeCD’s plugin contribution guide to make plugin development approachable for new contributors.

The guide explains how plugins fit into PipeCD core, the lifecycle/contracts contributors need to follow, and practical setup/testing patterns for building plugins safely.

I also aligned this with the broader docs structure updates in docs-dev and docs-v1.0.x so plugin docs match the rest of the contribution path.

This work came from issue #6124 and shipped after maintainer review rounds.

Links: PR #6398Issue #6124