chore: synced file(s) with getlarge/ticketing-exercises

[getlarge]

synced local file(s) with getlarge/ticketing-exercises.

Changed files

• created local directory exercises and copied all sub files/folders from remote directory exercises
• created local directory assets and copied all sub files/folders from remote directory assets
• created local CHALLENGES.md from remote README.md

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This PR was created automatically by the repo-file-sync-action workflow run #9643795121

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✅ Successfully ran 3 targets

• nx affected:test --parallel=4 --exclude=workspace --ci --verbose
• nx run-many --target=build --parallel=4 --projects=auth,expiration,ng-client,orders,payments,tickets --verbose
• nx affected:lint --parallel=4 --exclude=workspace --verbose

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