[chore] Add readme for root folder common (apache#46089)

zhannngchen · Dec 30, 2024 · 4eca76f · 4eca76f
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+This directory contains the shared dependency code for various modules.
+The code within the cpp directory primarily consists of common foundational code for the Backend (BE) and Meta Service (MS) modules, including object storage access and a testing framework for common C++ code.