[Docs] stream_contract crate has no README documenting public API, events, errors, and fee model

[grantfox-oss]

Telegram (ask questions / claim the issue here first): https://t.me/+DOylgFv1jyJlNzM0

Why this matters

There is no README anywhere under contracts/stream_contract and Cargo.toml has no description field. New integrators have no single entry point describing the create/top_up/withdraw/cancel/pause/resume lifecycle, the fee/treasury model (MAX_FEE_RATE_BPS=1000), the emitted events, or the StreamError codes.

Acceptance criteria

• Add contracts/stream_contract/README.md covering the public entrypoints, the protocol-fee/treasury model, the event topics, and the StreamError table
• Optionally add a description to Cargo.toml

Files to touch

• contracts/stream_contract/Cargo.toml
• contracts/stream_contract/src/lib.rs

Out of scope

• Repo-root README or CONTRIBUTING.md

[Kayce10]

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Please assign this issue to me my eta is 4 hours

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[midexol]

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

Hi maintainer, I'd like to work on this issue. Please assign

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[Killerjunior]

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Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

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[drips-wave]

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

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[grantfox-oss]

🦊 GrantFox — @Killerjunior has been assigned to this issue!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #798)
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