Write MR blog post for Graphics Tools

[Cameron-Micka]

Describe the issue

It would be nice to announce Graphics Tools on the Mixed Reality blog like we did for the Unreal version.

Feature area

Public announce.

Existing doc link

https://techcommunity.microsoft.com/t5/mixed-reality-blog/tighten-up-your-graphics-with-graphics-tools-for-mrtk-unreal/ba-p/2228600

Additional context

Lots of features to talk about. But we could create a few nice visuals and point people towards the conceptual docs and samples.