Add changelog

Author: bessman

CHANGELOG.md

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+# Changelog
+
+## [3.0.2] - 2024-07-28
+
+### Added
+
+- Add changelog (Alexander Bessman)
+
+### Fixed
+
+- Fix `I2C_CommandReadBulk` reading one too many bytes ([`4ea85ec`](https://github.com/fossasia/pslab-firmware/commit/4ea85ec9ecda2f9ec4dcab0b56f0de5edb6fbfaa)) (Alexander Bessman)
+
+## [3.0.1] - 2024-07-15
+
+### Fixed
+
+- Fix broken capacitance measurement ([`36d4fd3`](https://github.com/fossasia/pslab-firmware/commit/36d4fd31fe6edc3845e16ab71af899f61262b061)) (Alexander Bessman)
+- Fix second half of sample buffer not being cleared ([`54034b8`](https://github.com/fossasia/pslab-firmware/commit/54034b81549d735af3ab5050bdcd06a08269a6b2)) (Alexander Bessman)
+
+## [3.0.0] - 2024-01-15
+
+_Major refactorization of firmware._
+
+
+[3.0.0]: https://github.com/fossasia/pslab-firmware/releases/tag/v3.0.0