update readme

README.md

@@ -55,6 +55,13 @@ pip install rembg
 
 GPU support:
 
+First of all, you need to check if your system supports the "onnxruntime-gpu".
+Go to https://onnxruntime.ai/ and check the installation matrix.
+
+<p style="display: flex;align-items: center;justify-content: center;">
+  <img src="https://raw.githubusercontent.com/danielgatis/rembg/master/onnxruntime-installation-matrix.png" width="400" />
+</p>
+
 ```bash
 pip install rembg[gpu]
 ```