Add a note in README.md regarding pre-import of backend (#863)

With keras_core users has to import the backend first before importing keras_core. It has to be documented in README.md for better visibility and reach to the community.
keras-team · Sep 11, 2023 · 5404dfe · 5404dfe
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commit 5404dfe
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/README.md b/README.md
@@ -49,7 +49,8 @@ os.environ["KERAS_BACKEND"] = "jax"
 
 import keras_core as keras
 ```
-
+**Note:** The backend must be configured before importing keras_core, and the backend cannot be changed after 
+the package has been imported.
 ## Backwards compatibility
 
 Keras Core is intended to work as a drop-in replacement for `tf.keras` (when using the TensorFlow backend). Just take your