Added new resource types to the SDK with new examples

[ShocOne]

Change

• support for /api/startup-status with examples
• support for /api/system/initialze with examples
• support for /api/v4/enrollment and /api/v3/enrollment/access-groups with examples
• support for /api/self-service/branding/images with examples

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactor (refactoring code, removing code, changing code structure)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code