Add a CONTRIBUTING section specific to the analytics module

[phertyameen]

Description

Extend backend/contributing.md with analytics-specific guidance: how to add a new metric provider, where to add its endpoint, and the required test coverage before a PR can be merged.

Why this matters

The analytics module has more moving parts (entities, jobs, listeners, providers) than most modules; contributors need a checklist.

Files to touch

• backend/contributing.md

Acceptance Criteria

• New section covers: adding an entity, a provider, an endpoint, and tests
• Links to backend/src/analytics/README.md and EVENT_TAXONOMY.md

Notes

This issue is part of the new analytics module effort (tracking, aggregation,
and reporting on player/game activity). Please keep new code inside
backend/src/analytics/ following the same module/controller/service/provider
layout used by existing modules (e.g. progress, streak, quests).

[Chigybillionz]

Greetings,

I'd like to work on this issue.

I'll expand backend/contributing.md with a dedicated analytics contribution guide covering how to add new entities, providers, endpoints, and the required test coverage. I'll also link the relevant analytics documentation (backend/src/analytics/README.md and EVENT_TAXONOMY.md) and keep the guidance aligned with the existing module structure before opening the PR.

GitHub: https://github.com/chigybillionz

[Okorie2000-code]

Hi maintainer, I will love to work on this issue. Please assign it to me.
I can submit a clean PR within 48hrs.

[abdoolyaro]

Hi, I’d like to take this issue. I can add comprehensive unit tests for the retention curve provider, covering the happy path, empty results, and boundary date ranges using mocked repositories, ensuring the tests run cleanly with the existing test suite.

[mj24-blip]

Allow me fix this quickly

[grantfox-oss]

🦊 GrantFox — @mj24-blip has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #568)
2. Your PR will be reviewed by the MindBlockLabs maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@mj24-blip's PR #600 was approved and merged by @phertyameen.

🏆 @mj24-blip: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (121 total points). Track your full progress on GrantFox.

👏 Great work, @mj24-blip! Keep contributing to MindBlockLabs.