Added README

src/build_scripts/openvino/riscv-64/README.md

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+# OpenVINO Cross-Compilation for RISC-V
+
+## Build using Docker
+
+Install and configure Docker using [guide](../../../../docker/README).
+
+Build Docker image.
+
+```
+docker build -t openvino_riscv .
+```
+
+Run temporary Docker container using the built image to
+copy the installed OpenVINO libraries on host machine.
+
+```
+docker run -t openvino_riscv
+docker cp <container_name>:/openvino_riscv64_gnu .
+```
+
+Archive the folder `openvino_riscv64_gnu` and copy on the target
+platform RISC-V using `scp` utility or USB flash drive.
+
+```
+tar -cvf openvino_riscv64_gnu.tar openvino_riscv64_gnu/
+scp openvino_riscv64_gnu.tar <user>@<address>:<path>
+```
+
+On the target platform unarchive the files and activate OpenVINO environment.
+
+```
+tar -xvf openvino_riscv64_gnu.tar
+source openvino_riscv64_gnu/setupvars.sh
+```
+
+To check correctness of build try to import `openvino` package.
+
+```
+python3 -c 'import openvino'
+```
+
+
+## Manual build
+
+Clone [OpenVINO][ov_repo] repository.
+
+```
+git clone https://github.com/openvinotoolkit/openvino.git --branch 2023.2.0 && cd openvino
+git submodule update --init \
+    ./thirdparty/pugixml \
+    ./thirdparty/ade \
+    ./thirdparty/gflags/gflags \
+    ./thirdparty/protobuf \
+    ./thirdparty/json/nlohmann_json \
+    ./thirdparty/flatbuffers/flatbuffers \
+    ./thirdparty/onnx/onnx \
+    ./thirdparty/snappy \
+    ./thirdparty/zlib \
+    ./thirdparty/open_model_zoo \
+    ./src/plugins/intel_cpu/thirdparty/onednn \
+    ./src/bindings/python/thirdparty/pybind11
+```
+
+Install RISC-V packages.
+
+```
+sudo apt-get install -y gcc-riscv64-linux-gnu g++-riscv64-linux-gnu crossbuild-essential-riscv64
+sudo dpkg --add-architecture riscv64
+sudo sed -i -E 's|^deb ([^ ]+) (.*)$|deb [arch=amd64] \1 \2\ndeb [arch=riscv64] http://ports.ubuntu.com/ubuntu-ports/ \2|' /etc/apt/sources.list
+apt update -y && apt install -y --no-install-recommends libpython3-dev:riscv64
+```
+
+Install python requirements.
+
+```
+python3 -m pip install -r ./src/bindings/python/wheel/requirements-dev.txt
+python3 -m pip install -r ./src/bindings/python/src/compatibility/openvino/requirements-dev.txt
+```
+
+Copy custom CMake toolchain file to repository.
+
+```
+cp <path>/custom_riscv64.toolchain.cmake <path>/openvino/cmake/toolchains/custom_riscv64.toolchain.cmake
+```
+
+Build OpenVINO from source.
+
+```
+mkdir build && cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../../openvino_riscv64_gnu \
+         -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/custom_riscv64.toolchain.cmake \
+         -DENABLE_INTEL_CPU=ON -DENABLE_INTEL_GPU=OFF -DENABLE_INTEL_GNA=OFF -DENABLE_MULTI=OFF -DENABLE_AUTO=OFF -DENABLE_HETERO=OFF \
+         -DENABLE_PYTHON=ON -DPYTHON_MODULE_EXTENSION=$(riscv64-linux-gnu-python3-config --extension-suffix) \
+         -DPYBIND11_PYTHON_EXECUTABLE_LAST=/usr/bin/python3.10 -DENABLE_PYTHON_PACKAGING=ON
+make install -j $(proc)
+rm -rf ./build
+```
+
+The build OpenVINO libraries are stored in the folder `openvino_riscv64_gnu`.
+To copy these files, follow the instructions in the 'Building with Docker' section above.
+
+
+## Notes
+
+Please note that the versions of Python used to build the OpenVINO Python API and those installed on the RISC-V platform must be the same.
+
+
+<!-- LINKS -->
+[ov_repo]: https://github.com/openvinotoolkit/openvino