Update README.en.md

[anzipomelo]

adding compliance & Licensing part

Summary

• Explain the problem this PR solves or the feature it adds.
• Highlight any limitations, follow-up work, or open questions.

Changes

• Code
• Documentation
• Tests
• Examples / Tooling

Add a brief bullet list describing the key changes.

Testing

Describe how you tested the changes, including commands run or screenshots if relevant.

# examples:
<img width="1157" height="564" alt="image" src="https://github.com/user-attachments/assets/b736a4c1-5da7-4bb1-9f9f-f521a5847803" />


## Checklist
- [x ] I read and followed `CONTRIBUTING.md`.
- [x] I ran all relevant tests and they pass locally.
- [x] I updated documentation/examples if behavior changed.
- [x] I agree that this contribution will be released under the project's open-source license (see `LICENSE`).
- [x] I agree to follow the repository's Code of Conduct.

[Copilot]

Pull request overview

This PR adds a comprehensive "Compliance & Licensing" section to the English README, documenting the project's licensing terms, CLA requirements, and DCO guidance for contributors.

Key changes:

• Adds a new section explaining the Apache 2.0 license
• Documents CLA requirements for individual and corporate contributors
• Includes Developer Certificate of Origin (DCO) sign-off guidance

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[Copilot]

The referenced files CLA.md and CCLA.md do not exist in the repository. These links will be broken until the corresponding CLA documents are created and added to the project.

Suggested change

	* **Individual Contributors:** If you are contributing as an individual, please refer to our [Individual CLA (ICLA)](CLA.md).
	* **Corporate Contributors:** If you are contributing on behalf of an entity (e.g., a corporation or foundation), please refer to our [Corporate CLA (CCLA)](CCLA.md).
	* **Individual Contributors:** If you are contributing as an individual, please refer to the Individual Contributor License Agreement (ICLA) provided by the project maintainers.
	* **Corporate Contributors:** If you are contributing on behalf of an entity (e.g., a corporation or foundation), please refer to the Corporate Contributor License Agreement (CCLA) provided by the project maintainers.

[Copilot]

The reference to PULL_REQUEST_TEMPLATE.md is incorrect. The actual file in the repository is named pull_request_template.md (all lowercase). Additionally, the current pull request template does not contain a specific "CLA box" checkbox as mentioned in this note. The template only has a general license agreement checkbox that states "I agree that this contribution will be released under the project's open-source license".

Suggested change

	> **Note:** For individual contributors, submitting a Pull Request and checking the CLA box in the [PR Template](.github/PULL_REQUEST_TEMPLATE.md) constitutes your agreement to the ICLA terms.
	> **Note:** For individual contributors, submitting a Pull Request and checking the license agreement box in the [PR Template](.github/pull_request_template.md) constitutes your agreement to the ICLA terms.

[yaozhicheng]

Suggest changing it to: For all contributors, If you submit a PR, it means that you agree to comply with the above guidelines by default.

[yaozhicheng]

中文readme是不是应该一起同步得改呢

[anzipomelo]

中文readme是不是应该一起同步得改呢
有一种方法是在中文readme里加一句，以英文版为准。

[yaozhicheng]

PR模板要不不改吧，把 Note: For individual contributors, submitting a Pull Request and checking the license agreement box in the PR Template constitutes your agreement to the ICLA terms.去掉咋样？