add bls license

[pld]

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #[issue number] or Closes #[issue number]

Engineer Checklist

• [ ] I have run ./gradlew spotlessApply to check my code follows the project's style guide
• [ ] I have built and run the efsity jar to verify my change fixes the issue and/or does not break the application