[RUMF-912] 📝 add a warning in the RUM-recorder readme #838
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Motivation
Some customers seem to use the @datadog/browser-rum-recorder package even if they are not enrolled in our session replay beta.
Note: I tried adding the message as a package.json postinstall/install script, but it doesn't seem to work anymore in recent versions of NPM or yarn. The output is captured by the command and only printed if the script fails.
Changes
Add a clear message to advise them to use the RUM-only package.
Testing
Rendered: https://github.com/DataDog/browser-sdk/blob/e690632632769bc2320b658e320f377e8b921f4e/packages/rum-recorder/README.md#warning
I have gone over the contributing documentation.