Add backend compatibility table to documentation (#21733)

* Add backend compatibility table to documentation

* Remove redundant section and add OpenVINO version to compatibility table

Author: MalyalaKarthik66

README.md

@@ -55,6 +55,17 @@ python pip_build.py --install
 ./shell/api_gen.sh
 ```
 
+## Backend Compatibility Table
+
+The following table lists the minimum supported versions of each backend for the latest stable release of Keras (v3.x):
+
+| Backend    | Minimum Supported Version |
+|------------|---------------------------|
+| TensorFlow | 2.16.1                    |
+| JAX        | 0.4.20                    |
+| PyTorch    | 2.1.0                     |
+| OpenVINO   | 2025.3.0                  |
+
 #### Adding GPU support
 
 The `requirements.txt` file will install a CPU-only version of TensorFlow, JAX, and PyTorch. For GPU support, we also