[jira] [Created] (BEAM-13776) [Playground] Update Playground README

[Artur Khanin (Jira)]

Artur Khanin created BEAM-13776:
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             Summary: [Playground] Update Playground README
                 Key: BEAM-13776
                 URL: https://issues.apache.org/jira/browse/BEAM-13776
             Project: Beam
          Issue Type: Task
          Components: beam-playground
            Reporter: Artur Khanin


Add links to the backend and frontend CONTRIBUTE files into the Playground 
README.



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