New Example on creating a custom GradientTransformation

[SauravMaheshkar]

Motivation

Recently for a personal project (#641) I wanted to created a custom GradientTransformation object and found out that there wasn't a tutorial or walkthrough on how to create one. While the "Gradient Transformations" section in the README.md section was somewhat helpful, I still had to look around and search for example implementations in other repositories and within the contrib sub-package.

Proposal

Create a new example or a page in the documentation containing instructions on how to create a custom GradientTransformation object.

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Happy to contribute and work on this.

[fabianp]

hey @SauravMaheshkar , yes, I believe a short example on this on the example/ directory would be welcomed!. I'll assign you this issue.

Thanks for suggesting this!

[SauravMaheshkar]

Also tagging #958 and #641