docs: add disclaimer, contributing summary, and sponsorship

Two user-facing additions modelled on the streborn project's README:

  - **Disclaimer section in README.** Stronger Bose-trademark clause,
    explicit "not affiliated, endorsed, sponsored, or connected"
    statement, and the EU 2009/24/EC Art. 6 interoperability clause
    with a stable EUR-Lex hyperlink. Adds a Stockholm-specific
    sentence: users supply the Stockholm web-app sources themselves,
    no Bose code is redistributed in this repo.

  - **Ways to Contribute / Support the project in README and
    CONTRIBUTING.** Itemises the contribution categories users
    actually have (code, docs, bug reports, donations) and adds the
    GitHub Sponsors badge for gesellix. Sponsorship is explicitly
    optional and licensing-neutral.

The thin "Not affiliated" line at the top of the README now points at
the full Disclaimer section rather than carrying the whole statement.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -2,6 +2,17 @@
 
 Thank you for your interest in contributing to the Bose SoundTouch API Client! This project aims to provide a comprehensive, reliable, and well-tested Go library for controlling Bose SoundTouch devices.
 
+## Ways to Contribute
+
+All contributions are welcome — large or small:
+
+- **Code suggestions** — bug fixes, new features, refactoring, performance improvements.
+- **Documentation updates** — README, guides, examples, troubleshooting notes, inline doc comments.
+- **Bug fixes** — even just a clear reproducer in an issue is a real contribution.
+- **Donations** — if the project kept a speaker (or several) of yours alive past the Bose cloud shutdown and you want to give back, [GitHub Sponsors](https://github.com/sponsors/gesellix) is open. No expectation; everything in this repo stays MIT regardless.
+
+By submitting a code or documentation contribution you agree to license it under MIT. The detailed guides below cover the mechanics.
+
 ## Table of Contents
 
 - [Code of Conduct](#code-of-conduct)
@@ -15,6 +26,7 @@ Thank you for your interest in contributing to the Bose SoundTouch API Client! T
 - [Reporting Issues](#reporting-issues)
 - [Device Testing](#device-testing)
 - [Community](#community)
+- [Support the Project](#support-the-project)
 
 ## Code of Conduct
 
@@ -465,6 +477,14 @@ Contributors will be:
 - **Mentioned in release notes** for significant contributions
 - **Credited in documentation** where appropriate
 
+## Support the Project
+
+If you want to support the maintenance effort beyond code:
+
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/gesellix?label=Sponsor%20on%20GitHub&logo=GitHub&color=ea4aaa)](https://github.com/sponsors/gesellix)
+
+Sponsorship is entirely optional. Code, docs, and bug reports remain the most useful contributions for the project itself.
+
 ## Additional Resources
 
 - [Go Documentation](https://golang.org/doc/)

README.md

@@ -4,7 +4,9 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/gesellix/bose-soundtouch)](https://goreportcard.com/report/github.com/gesellix/bose-soundtouch)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
-> Independent project. Not affiliated with or endorsed by Bose Corporation.
+> Independent project. **Not affiliated with, endorsed by, sponsored
+> by, or otherwise connected to Bose Corporation.** See
+> [Disclaimer](#disclaimer) for the full statement.
 
 ## Context: Cloud Shutdown
 
@@ -122,8 +124,35 @@ See the [API Reference](https://gesellix.github.io/Bose-SoundTouch/reference/API
 
 ---
 
+## Contributing
+
+Issues and pull requests welcome — code, documentation, bug reports, and feature ideas all land in the same place. By submitting a contribution you agree to license it under MIT. For significant changes please open an issue first to discuss the approach. See [CONTRIBUTING.md](CONTRIBUTING.md) for the full guide.
+
+## Support the project
+
+If this toolkit kept a speaker (or several) of yours alive past the Bose cloud shutdown and you want to give back, [GitHub Sponsors](https://github.com/sponsors/gesellix) is open. No expectation — everything in this repo stays MIT regardless.
+
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/gesellix?label=Sponsor%20on%20GitHub&logo=GitHub&color=ea4aaa)](https://github.com/sponsors/gesellix)
+
+## Disclaimer
+
+This is an independent open-source project. **Bose** and **SoundTouch**
+are registered trademarks of Bose Corporation in the United States and
+other countries. This project is **not affiliated with, endorsed by,
+sponsored by, or otherwise connected to** Bose Corporation.
+
+The toolkit exists solely to restore functionality of Bose SoundTouch
+speakers after the official cloud service shutdown on May 6, 2026.
+Reverse engineering for the sole purpose of interoperability is
+permitted under [EU Directive 2009/24/EC, Article 6](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32009L0024)
+("Decompilation"), and comparable provisions in other jurisdictions.
+
+The optional Stockholm frontend integration (`STOCKHOLM_DIR`) requires
+the user to supply the Stockholm web-app sources themselves; no Bose
+code is redistributed in this repository.
+
+The software is provided AS IS, without warranty. Use at your own risk.
+
 ## License
 
 MIT — see [LICENSE](LICENSE).
-
-SoundTouch is a trademark of Bose Corporation.