Add Cadence Logos

[demirkayaender]

Changes can be viewed here: https://github.com/demirkayaender/artwork/blob/cadence-artwork/examples/sandbox_a-j.md#cadence-logos

Pre-submission checklist:

If you're adding a new project to the repo, please confirm each of these actions has been completed:

• Artwork is supplied in both PNG and SVG formats.
• SVGs are real vector-based files. Test and optimize them at https://autocrop.cncf.io before submitting.
• Artwork includes 3 layouts: horizontal (landscape), stacked, and icon.
• At least 3 versions of the artwork are provided: color, black, and white.
• Files follow the existing repo folder and naming conventions.
• The correct examples/file.md is updated with a section for the logos added, in A-Z order.
• A link to the new logo section is added to the main README.md, in A-Z order.

Note: Updates to this repo require two approvals to be merged in. One from a CNCF staff member, and the other from a project maintainer whose project's artwork is being updated. We can bypass branch protections for PRs made by maintainers.

[nate-double-u]

Hi, thanks for this @demirkayaender.

I'm not sure why the colour and black versions of the horizontal logo are different, but if you're not going to go with an actual colour version of it, I'd choose the cadence-horizontal-black.png version as it's a cleaner image.

I do recommend developing a colour set of logos though. If you'd like, we can have our design team help with this.

[demirkayaender]

@nate-double-u , thanks for catching this! I haven't realized the black horizontal version was using bold letters. I will send an update for the others using the same format.

Color one isn't really used, we typically use black (most common) or the white one. How about we land consistent sets after my change for now? After then, we'd appreciate getting some help with the color ones.

[nate-double-u]

Sounds good! When you're ready for color, open a support desk ticket and we'll be happy to help out. We can keep this update separate from that one.

[nate-double-u]

Looks good to me, thanks for the update @demirkayaender!