Created Java + Spring boot experts file

[RagavanPV]

Description

Experts file prompts best practices for Java + Spring boot with Flyway migration

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• ♻️ Refactor Changes
• 💅 Cosmetic Changes
• 📚 Documentation update
• 🏃 Workflow Changes

Pre-flight Checklist

• Changes are limited to a single feature, bugfix or chore (split larger changes into separate PRs)
• Tests are passing (npm test) and code is formatted and linted (npm run format && npm run lint)
• I have created a changeset using npm run changeset (required for user-facing changes)
• I have reviewed contributor guidelines

Screenshots

Additional Notes

Expert issue associated with this addition - #130

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