docs: update readme

[sidwebworks]

No description provided.

[greptile-apps]

Greptile Summary

This PR represents a major documentation strategy change that dramatically simplifies the README.md from a comprehensive 482-line developer guide to just 5 lines. The new README contains only the SDK title, a brief description, and a link redirecting developers to the external documentation at https://infisical.com/docs/sdks/languages/java.

The original README contained extensive content including:

• Maven and Gradle installation instructions
• Multiple authentication method examples (Universal Auth, Machine Identity, LDAP)
• Comprehensive API method documentation for secrets and folders management
• Code samples and usage examples
• Configuration options and error handling guidance

This change represents a centralization strategy where the team is consolidating all SDK documentation to their official documentation website rather than maintaining parallel documentation in the repository. This approach creates a single source of truth and reduces the maintenance burden of keeping multiple documentation sources in sync. The Java SDK joins what appears to be a broader pattern across Infisical's SDK repositories of directing developers to the centralized documentation hub.

The integration fits into the codebase structure by maintaining the README.md file as the primary entry point for developers, but now serving as a redirect mechanism rather than a comprehensive guide. The actual SDK functionality in /src/main/java remains unchanged, with all the documented features still available through the same API interfaces.

Confidence score: 3/5

• This PR represents a significant user experience change that may frustrate developers expecting comprehensive repository documentation
• Score reflects the fact that while no code functionality is broken, this creates a notable barrier for developers who rely on repository READMEs for quick reference and getting started
• Pay close attention to developer adoption metrics and feedback, as this change may impact SDK discoverability and ease of onboarding

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