docs: comprehensive README.md rewrite

[Copilot]

The existing README lacked structure, had minimal feature coverage, and provided no Gradle setup, prerequisites, or actionable usage examples.

Changes

• Table of Contents — linked navigation for all sections
• Prerequisites — explicit Java (8/11/17/21/25) and Maven 3.6+ requirements
• Features — replaced flat bullet list with descriptive summaries per capability area
• Modules table — added Artifact ID column; corrected microsphere-lang-model name
• Getting Started — added Gradle snippet alongside Maven; cleaned up XML formatting
• Usage examples — replaced single StringUtils test stub with five working examples: StringUtils, CollectionUtils, reflection via FieldUtils/MethodUtils, type conversion via Converters, event dispatching (EventDispatcher), and Version detection
• Documentation — consolidated the split "Documentation / User Guide" sections into a single reference table (DeepWiki, Zread, Wiki, release notes, JavaDoc)
• Contributing — numbered workflow replacing vague prose
• Getting Help — new section: issue tracker, Discussions, DeepWiki
• Maintainers — new table with role and contact
• License — changed external URL to relative ./LICENSE link

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.