Add CHANGELOG.md

CHANGELOG.md

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+# CHANGELOG
+
+## [0.2.0] - 2025-09-15
+
+### Breaking changes
+    - Updated the trait `FillUniform` to take `log_bound`.
+
+### `poulpy-hal`
+    - Added pure Rust reference code for `vec_znx` and `fft64` backend.
+    - Added cross-backend generic test suite along with macros.
+    - Added benchmark generic test suite.
+
+### `poulpy-backend`
+    - Added `FFTRef` backend, which provides an implementation relying on the reference code of `poulpy-hal`.
+    - Added `FFTAvx` backend, which provides a pure Rust AVX/FMA accelerated implementation of `FFTRef` backend.
+    - Added cross-backend tests between `FFTRef` and `FFTAvx`.
+    - Added cross-backend tests between `FFTRef` and `FFT64Spqlios`.
+
+### `poulpy-core`
+    - Removed unsafe blocks.
+    - Added tests suite for `FFTRef` and `FFTAvx` backends.
+
+### Other
+- Fixed a few minor bugs.
+
+## [0.1.0] - 2025-08-25
+- Initial release.