Add CHANGELOG

CHANGELOG.md

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+# Shift
+
+A fork of KDE Plasma Mobile that adds a desktop-class convergence mode.
+
+Plasma Mobile is a phone shell. It doesn't try to be anything else.
+Shift picks up where it leaves off: when you connect a monitor, keyboard,
+or mouse, the same device should feel like a desktop. No second OS, no
+separate session — one shell that adapts.
+
+## What's different from upstream
+
+The upstream `plasma-mobile` repo provides the phone experience: homescreens,
+a swipe-based navigation panel, an action drawer, and a status bar. All of
+that still works. Shift adds a **convergence mode** layer on top — toggled
+via `plasmamobilerc` — that swaps in desktop-oriented behaviour without
+replacing the phone UI underneath.
+
+Key changes so far:
+
+- **Unified dock** replacing the navigation panel in convergence mode,
+  with running-app indicators, favourites, context menus, and hover
+  tooltips.
+- **App drawer** opening as a centered popup instead of a full-screen
+  swipe.
+- **Window management** — edge tiling, screen-edge maximize, close
+  buttons, task context menus, Overview integration.
+- **Status bar** gains a system tray, date display, and hover highlights.
+- **Screen space reservation** for the dock via a layer-shell exclusive
+  zone, so maximized windows don't overlap it.
+- **Desktop niceties** — right-click wallpaper settings, minimize-all on
+  home press, clickable page indicators, action drawer toggle on click.
+
+## Upstream base
+
+Forked from `plasma-mobile` at KDE's Plasma 6 branch. Upstream commits
+(translations, silent fixes) are preserved in the early history.