Add module README for properties and transactions

[nanaf6203-bit]

Create README files for the property and transaction modules.

Acceptance Criteria:

• Properties README describes endpoints and domain behavior.
• Transactions README captures lifecycle and audit expectations.
• README files include developer notes.
• Docs are linked from the root README.

[Henrichy]

@Henrichy has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

My name is Henry Nzekwe, a Full Stack Software Developer with experience in backend development, API design, technical documentation, and maintaining developer-friendly codebases. I am interested in contributing to the "Add module README for properties and transactions" task.

I understand the importance of clear documentation for onboarding contributors and ensuring long-term maintainability. For this task, I will create comprehensive README files for both the Properties and Transactions modules, clearly documenting their endpoints, business logic, domain behavior, transaction lifecycle, and audit expectations. I will also include developer notes covering implementation details, common workflows, and maintenance considerations. Finally, I will update the root README to link to these module-specific documents, ensuring easy discoverability and a consistent documentation structure throughout the project.

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

[nafsonig]

@nafsonig has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, i fully understand the scope of this issue and i will implement it as soon as possible with an ETA of 3 hours

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

[drips-wave]

Congratulations, @nafsonig! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @nafsonig: 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.

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[drips-wave]

This issue has been completed by @nafsonig as part of the Stellar Wave Program's 5th Wave 🥳

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