Add a couple of GaugeTransformer in the top-level init.

[babacry]

Also include documents for some gauge transformers.

[mhucka]

@babacry Is this still a work in progress, by any chance? If so, could I ask that the PR be turned to a draft PR, so that it's more clear that it doesn't need to be reviewed yet?

[babacry]

Thanks! I am still working on it, converted it into draft now, I need to create json serialization and deserialization later.

[mhucka]

Thanks! I am still working on it, converted it into draft now, I need to create json serialization and deserialization later.

Excellent. Thank you!

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