docs: add CHANGELOG

Author: emmanuel-ferdman

CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+## [0.1.0] - Unreleased
+
+Initial release.
+
+### Added
+
+* Astroid inference for Qt signals across PyQt5, PyQt6, PySide2, and PySide6
+* Support for `Signal()` instances exposing `connect`, `disconnect`, and `emit`
+* Support for built-in widget signals (e.g. `QPushButton.clicked`, `QTimer.timeout`)
+* Support for subscripted signals (e.g. `signal[int]`)
+* Support for class-attribute signals accessed via `self` and via the class