Add changelog (#11)

Author: andreiavrammsd

CHANGELOG.md

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+# Changelog
+
+## [v0.1.0](https://github.com/andreiavrammsd/static_vector.rs/tree/v0.1.0) (2025-05-20)
+
+### Added
+- Initial release of `static_vector.rs`.
+- Implemented a no-std, stack-allocated vector with fixed capacity and dynamic length.
+- Aimed for compatibility with low-level projects requiring explicit and safe APIs.