Added instructions to install OpenVINO from release packages

Author: suryasidd

backends/openvino/README.md

@@ -40,7 +40,9 @@ executorch
 
 ### Prerequisites
 
-Before you begin, ensure you have openvino installed and configured on your system:
+Before you begin, ensure you have openvino installed and configured on your system
+
+### Build OpenVINO from Source
 
 ```bash
 git clone https://github.com/openvinotoolkit/openvino.git
@@ -56,7 +58,27 @@ cmake --install build --prefix <your_preferred_install_location>
 cd <your_preferred_install_location>
 source setupvars.sh
 ```
-Note: The OpenVINO backend is not yet supported with the current OpenVINO release packages. It is recommended to build from source. The instructions for using OpenVINO release packages will be added soon.
+
+### Build OpenVINO from Release Packages
+
+1. Download the OpenVINO release package from [here](https://docs.openvino.ai/2025/get-started/install-openvino.html). Make sure to select your configuration and click on **OpenVINO Archives** under the distribution section to download the appropriate archive for your platform
+
+2. Extract the release package from the archive and set the environment variables
+
+#### Linux
+   ```bash
+   tar -zxf openvino_toolkit_<your_release_configuration>.tgz
+   cd openvino_toolkit_<your_release_configuration>
+   source setupvars.sh
+   ```
+
+#### Windows
+   ```bash
+   tar -xf openvino_toolkit_<your_release_configuration>.zip
+   cd openvino_toolkit_<your_release_configuration>
+   setupvars.bat
+   ```
+
 For more information about OpenVINO build, refer to the [OpenVINO Build Instructions](https://github.com/openvinotoolkit/openvino/blob/master/docs/dev/build_linux.md).
 
 ### Setup