Update README.md

Author: nzeltzer

README.md

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+# ⚠️ Notice: Pocket Has Been Shut Down
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+As of July 8, 2025, Pocket has been shut down and is no longer under active development.
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+This repository is preserved for historical reference only and will not receive further updates, bug fixes, or security patches.
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+For more details, see [Mozilla’s announcement](https://support.mozilla.org/en-US/kb/future-of-pocket).
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 # Web Client
 
 > Reaching for the promise of a healthy internet.