Update README.md with comment header

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Author: dingonzo

README.md

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 # Dynamic_Array
  [![C/C++ CI](https://github.com/dingonzo/dynamic-array/actions/workflows/c-cpp.yml/badge.svg)](https://github.com/dingonzo/dynamic-array/actions/workflows/c-cpp.yml)
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 Testing & Validation
 This repository includes a dedicated test suite.
 * **Memory Safety:** Verified the "Big Three" (Destructor, Copy Constructor, Assignment Operator) for deep copy integrity.