Create changelog

Changelog.md

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+# Changelog
+
+## V0.2.0
+
+- Convert slice operation window to a dockable panel
+- Render parts of models that go beyond the print volume red
+- Remove the Stats panel and merge it into the Workspace panel
+- Add documentation into the About panel
+- Add random triangle color mesh render mode
+- Persist panel layout between sessions. I also added a button to the File menu to reset the UI layout.
+
+## v0.1.0 — Feb 12, 2025
+
+First release!
+
+I havent really changed much in the past like six months, but now mslicer is on Flathub.