docs: add a changelog and the release notes flow

CHANGELOG.md

@@ -0,0 +1,73 @@
+# Changelog
+
+What each release brings, newest first. The [GitHub releases](https://github.com/LoonixTools/middleclick-autoscroll/releases) add every commit that went into it. Versions before `v1.1.0` came without notes.
+
+## v1.5.1
+
+_2026-09-15_
+
+A small patch. Autoscroll now works in Brave, which has its own name for it. AppImages are recognised too: an Electron AppImage gets autoscroll like any other app, and one that cannot autoscroll at all, like Modrinth, is left out of the list.
+
+## v1.5.0
+
+_2026-09-08_
+
+Welcome to middleclick-autoscroll `v1.5.0`! A middle click now scrolls everywhere instead of pasting text.
+
+```
+  Autoscroll                     ON
+
+  Applications covered           11 of 13
+  Steam                          ON
+  New applications               ON
+  Middle-click paste             off
+```
+
+### Highlights
+
+- Middle-click paste is off
+
+## v1.4.0
+
+_2026-09-06_
+
+Welcome to middleclick-autoscroll `v1.4.0`! This one is all about Steam.
+
+### Highlights
+
+- Steam stops reinstalling itself
+- Scripts that start Steam
+
+## v1.3.0
+
+_2026-09-04_
+
+Welcome to middleclick-autoscroll `v1.3.0`! Browsers look clean again, and Helium joins the list.
+
+### Highlights
+
+- No more warning bar in browsers
+- Autoscroll in Helium
+
+## v1.2.0
+
+_2026-09-01_
+
+Welcome to middleclick-autoscroll `v1.2.0`! Steam keeps its autoscroll now, however you start it.
+
+### Highlights
+
+- Steam keeps autoscroll
+- More ways to start Steam
+
+## v1.1.0
+
+_2026-08-24_
+
+Welcome to middleclick-autoscroll `v1.1.0`! It now works far beyond Arch, with packages that keep themselves up to date.
+
+### Highlights
+
+- Debian, Ubuntu, Fedora and openSUSE
+- Packages that update with your system
+- Steam fixes