Add license file

[amotl]

About

It is important that a public project includes a license file, to resolve potential problems early, before they occur.
Educational material is mostly using open licenses at CrateDB, so others can use it as blueprints to build upon,
and also to clarify concerns about liability. In this spirit, this patch just slaps the Apache license on it, like CrateDB and family members are using anyway.

References

• Sample applications: Add card about CrateDB real-time analytics demo cratedb-guide#559

[coderabbitai]

Walkthrough

A new Apache License 2.0 file is added to the repository, establishing the full legal terms and conditions for software use, including copyright and patent grants, redistribution requirements, warranty disclaimers, and liability limitations.

Changes

Cohort / File(s)	Summary
License Agreement LICENSE	Added Apache License 2.0 (January 2004) containing standard definitions, copyright and patent grants, redistribution requirements, contribution submission terms, trademark notice, and warranty/liability disclaimers.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A legal carrot patch so fine,
Apache two-oh claims this line,
Copyright and patents intertwine,
Now the project's terms align! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add license file' directly and clearly summarizes the main change - adding an Apache License 2.0 file to the repository.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining the rationale for adding an Apache License 2.0 file and referencing related work.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch license

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