add readme for MONAI + Fed-BioMed integration for federated learning

Author: mvesin

federated_learning/fedbiomed/README.md

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+# Federated learning with Fed-BioMed
+
+[Fed-BioMed](https://github.com/fedbiomed/fedbiomed), a collaborative learning framework for real-world healthcare applications, provides tutorials for training a federated learning model using MONAI components.
+
+## Please visit [here](https://fedbiomed.org/latest/tutorials/monai).
+