chore(#179):update cht-docs with apdex automation tests set-up (#1551)

* added-apdex-automation-tests-cht-docs

* Fix internal ref link and add intro statement

* Fix weight

* Fix bad link

* Add bullet points

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Co-authored-by: Rafa <[email protected]>
Co-authored-by: esthermmoturi <[email protected]>