doc: add a note on XPU plugin availability (meta-pytorch#1483)

Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>
Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>

Author: dvrogozh

README.md

@@ -117,8 +117,6 @@ with encoder.open_file("output.mp4"):
    and Windows this will install CPU-only wheels. CPU wheels are available for
    Linux (x86_64 and aarch64), macOS, and Windows.
 
-   For other versions of PyTorch, refer to the compatibility table below.
-
 ### CUDA support
 
 CUDA-enabled wheels are installed by default on Linux. For Windows, you'll need
@@ -164,7 +162,25 @@ default):
 pip install torchcodec --index-url=https://download.pytorch.org/whl/cpu
 ```
 
-### Compatibility
+### XPU support
+
+Intel GPUs (XPU) support requires a stand-alone plugin for TorchCodec:
+
+```bash
+pip install torchcodec-xpu --extra-index-url=https://download.pytorch.org/whl/xpu
+```
+
+Upon installation, the plugin needs to be imported:
+
+```python
+import torchcodec_xpu
+```
+
+For any XPU-related support, please refer to
+https://github.com/intel/torchlib-xpu.
+
+
+### Compatibility with `torch` versions
 
 The following table indicates the compatibility between versions of
 `torchcodec`, `torch` and Python.