Add CONTRIBUTING.md with issue labels and dev setup

[devsimze]

Problem

Contributors lack a single guide for labels, cargo test, and Stellar CLI versions.

Scope

• New CONTRIBUTING.md

Acceptance criteria

• Link to good-first issues, CI requirements, and code style (ERROR_STYLE_GUIDE.md).

[Awointa]

That already reads well. If you want it a bit tighter and more natural for claiming OSS issues, I’d use:

Hi, I’m interested in working on this issue. I have experience writing contributor-focused documentation for open-source projects, and I can create a well-structured CONTRIBUTING.md covering setup requirements, cargo test workflow, supported Stellar CLI versions, CI expectations, code style guidelines (ERROR_STYLE_GUIDE.md), and links to good-first issues to make onboarding easier for new contributors.

[divysam]

@divysam has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello
I would love to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @divysam to this issue.

[covenantalade]

@covenantalade has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Let me work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @covenantalade to this issue.

[drips-wave]

Congratulations, @covenantalade! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @covenantalade: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🦊 GrantFox — @covenantalade has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #295)
2. Your PR will be reviewed by the Neurowealth maintainers

Good luck! Track your progress on GrantFox.