Create readme file

Author: oleksandr-pavlyk

README.md

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+# About intel-gpu-ocl-icd-system
+
+Home: https://github.com/IntelPython/intel-gpu-ocl-icd-feedstock
+
+Package license: Apache 2
+
+Feedstock license: Apache 2
+
+Summary: Symlink system-wide OpenCL ICD file for Intel(R) GPUs to current environment
+
+Since GPU drivers are installed system-wide, and the OpenCL loader in conda environment
+is configured to look for ICD files in ``${CONDA_PREFIX}/etc/OpenCL/vendors`` to isolate
+the conda environment from the system environment, enabling discovery of Intel GPU devices
+by the OpenCL loader requires creation of appropriate ICD file in the conda environment's
+own vendors folder. This metapackage creates such an ICD as a symbolic link to the ICD
+installed system-wide.