Create README.md

README.md

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+prebuilt openmpi4 + cpp bindings for AMD mi300x instances. to use:
+```
+wget -qO openmpi4.tar.gz https://huggingface.co/datasets/electroglyph/openmpi4/resolve/main/openmpi4-prebuilt.tar.gz
+sudo tar -xzvf openmpi4.tar.gz -C /
+sudo sh -c 'echo "/opt/openmpi/lib" > /etc/ld.so.conf.d/openmpi.conf'
+sudo ldconfig
+export PATH="/opt/openmpi/bin:$PATH"
+export LD_LIBRARY_PATH="/opt/openmpi/lib:$LD_LIBRARY_PATH"
+mpirun --version
+```