[wp-trac] [WordPress Trac] #53550: Add readme to e2e tests folder

[WordPress Trac]

#53550: Add readme to e2e tests folder
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 Reporter:  isabel_brison     |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 The /tests/e2e folder should have a readme with useful info on how to run
 the tests locally and perhaps links to docs such as the utils package.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53550>
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