docs: add links to credit card approval space in use case examples

use_case_examples/credit_card_approval_prediction/README.md

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+# Encrypted Credit Card Approval Prediction Using Fully Homomorphic Encryption
+
+Zama has created a [Hugging Face space](https://huggingface.co/spaces/zama-fhe/credit_card_approval_prediction) to make predict credit card eligibility decisions while maintaining strict data privacy using [Concrete ML](https://github.com/zama-ai/concrete-ml). This means the data is encrypted both in transit and during processing. More details can be found directly in the [app](https://huggingface.co/spaces/zama-fhe/credit_card_approval_prediction) and all development files are available [here](https://huggingface.co/spaces/zama-fhe/credit_card_approval_prediction/tree/main).