docs: add vvvv gamma to compatible software list

[tebjan]

Summary

• Adds vvvv gamma to the compatible software documentation page
• vvvv gamma is a visual live-programming environment for .NET with OpenColorIO integration via the VL.OCIO package
• Supports real-time GPU color transforms, builtin ACES 2.0 and 1.3 configurations, custom configs from file (live-switchable at runtime), and HDR color grading workflows

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tebjan / name: Tebjan Halm (9ca3280)

[doug-walker]

Thanks @tebjan , this sounds like a nice addition to vvvv. If you would like to add the vvvv logo to the opencolorio.org home page, you could check out this PR as an example of how to do that.

[carolalynn]

This is fine but like @doug-walker said - let us know if you'd like to also add a website logo, or just merge this as is.

[doug-walker]

@tebjan , we need you to sign your commit (amend and force push) in order to fix the DCO sign-off check. This is a hard requirement for us to merge your PR. Thanks for your help.