Add section about experiments

What does this MR do?

Documenting how Growth wants to conduct experiments. Related issue discussion: https://gitlab.com/gitlab-org/growth/discussion/issues/1#note_218810546.

This MR should start a discussion and as a goal, we should have a detailed process how experiments work.

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assigned to @nicolasdular

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mentioned in merge request !17703 (merged)

mentioned in merge request !16482 (merged)

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Thanks for this @nicolasdular! Very helpful!

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assigned to @pcalder

@pcalder could you also please have a look and approve? Still need to find someone who can merge this :)

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FYI @rdickenson doc change for Growth experiments

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Thanks for your reviews @rdickenson and @pcalder - I've implemented your feedback.

Assigning to @bmarnane for review :)

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Looks good @nicolasdular but I don't have permission to merge, will need to go to a gitlab.com maintainer.

assigned to @axil

Since there is no review roulette for doc changes, @axil could you please do a maintainer review and approve/merge if it's passes your review?

unassigned @axil, @bmarnane, and @pcalder

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