Update README.md

Co-authored-by: ES-Alexander <[email protected]>

README.md

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-> **Warning** If you are using BlueOS, please follow the [new documentation](https://blueos.cloud/docs).
+> ⚠️ **Warning** ⚠️ The Companion onboard computer software is no longer being developed or supported. New projects and vehicles are recommended to use [BlueOS](https://blueos.cloud/docs/blueos/latest/) instead.
 
 # Overview