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Update building_from_source.rst for OpenHarmony

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This is cross-compile guide of using the OHpro in OpenHarmony, so we'd like to contribute it. Hope my PR can help developers use this library for compilation.

Update gettingstarted.rst by adding usage about compilation through c…

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we support configure compilation for OpenHarmony projects, so we'd like to add usage in the gettingstarted.rst file.

Update README.md with OpenHarmony build project

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We support build project of OHpro in OpenHarmony, so we'd like to contribute it. Hope my PR can help developers use this library.