[Documentation] New Trial template design

[andreyvelich]

/area docs

We should document our new trial template design and how to use new CRD in the Trial template.

Since user doesn't need to manually modify controller source code to support new CRD, do we need new-trial-kind in our Katib repository ?
Or it is better to add this information under https://www.kubeflow.org/ website ?

@gaocegege @johnugeorge What do you think ?

[k8s-ci-robot]

@andreyvelich: The label(s) kind/docs cannot be applied, because the repository doesn't have them

In response to this:

/kind docs

We should document our new trial template design and how to use new CRD in the Trial template.

Since user doesn't need to manually modify controller source code to support new CRD, do we need new-trial-kind in our Katib repository ?
Or it is better to add this information under https://www.kubeflow.org/ website ?

@gaocegege @johnugeorge What do you think ?

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[andreyvelich]

/area release
/priority p1

[gaocegege]

LGTM