*: add license

[lidezhu]

What problem does this PR solve?

Issue Number: close #1515

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

Please refer to [Release Notes Language Style Guide](https://pingcap.github.io/tidb-dev-guide/contribute-to-tidb/release-notes-style-guide.html) to write a quality release note.

If you don't think this PR needs a release note then fill it with `None`.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Summary of Changes

Hello @lidezhu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to establish clear licensing for the project by adding the main project license and documenting the licenses of external dependencies. This ensures legal clarity and compliance for the codebase.

Highlights

• Project Licensing: Added the Apache License, Version 2.0, as the primary license for the repository. This new file (LICENSE) contains the full text of the license.
• Third-Party Licensing: Introduced a third-party-license.txt file to document the licenses for included third-party components. Currently, it lists go-sql-driver/mysql and golang-lru, both under the Mozilla Public License Version 2.0.

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[gemini-code-assist]

Code Review

This pull request adds a LICENSE file and a third-party-license.txt file. The copyright placeholder in the LICENSE file needs to be updated. Grammatical corrections and a newline character are suggested for third-party-license.txt.

[lidezhu]

/retest

[ti-chi-bot]

@lidezhu: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-pulsar-integration-light	f511444	link	false	/test pull-cdc-pulsar-integration-light

Full PR test history. Your PR dashboard.

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[lidezhu]

/run-check-issue-triage-complete