Update README.md

Signed-off-by: Susa Tünker <[email protected]>

README.md

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+:warning: Deprecation Notice :warning:
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+We have deprecated the score-helm CLI implementation. To get started with Score, we recommend using one of our reference implementations [score-compose](https://github.com/score-spec/score-compose) or [score-k8s](https://github.com/score-spec/score-k8s). If you're interested in developing a score-helm reference implementation, we'd love to support you! Please reach out to us for assistance and collaboration.
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+---
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 ![Score banner](docs/images/banner.png)
 
 # ![Score](docs/images/logo.svg) Score overview