docs: Add QA testing checklist

TESTING.md

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+# Testing
+
+This document provides a regression testing checklist for COSMIC Settings and the COSMIC Settings Daemon. The checklist provides a starting point for Quality Assurance reviews.
+
+## Checklist
+
+### Network & Wireless
+
+#### Wi-Fi
+
+- [ ] Able to disconnect from and connect to a network.
+
+### Desktop
+
+#### Wallpaper
+
+- [ ] Clicking a different wallpaper switches to it immediately
+- [ ] Leaving the page and coming back does not change the wallpaper
+
+#### Appearance
+
+- [ ] Open a COSMIC app and a GNOME app. When switching between Dark and Light mode, the COSMIC app switches immediately, and the GNOME app switches after restarting.
+- [ ] Changing the accent color works.
+- [ ] Changing the roundness style works and does not affect other aspects of the theme (e.g. color mode).
+- [ ] Changing the interface density works.
+
+#### Panel
+
+- [ ] Enable tiling. "Automatically hide panel" takes effect immediately.
+- [ ] Disable tiling; maximize a window. "Automatically hide panel" takes effect immediately.
+
+#### Dock
+
+- [ ] Enable tiling. "Automatically hide dock" takes effect immediately.
+- [ ] Disable tiling; maximize a window. "Autommatically hide dock" takes effect immediately.
+- [ ] Changing position on screen works.
+- [ ] All Style settings take effect as expected.
+
+### Displays
+
+- [ ] Plug in a second display. Displays can be rearranged via dragging.
+
+### Sound
+
+TBD after devices/profiles are fixed.
+
+### Power & Battery
+
+- [ ] Changing power mode takes effect and is reflected by top panel applet.
+
+### Input Devices
+
+#### Touchpad
+
+- [ ] All click behavior settings work as expected.
+- [ ] All scrolling settings work as expected.
+
+### Applications
+
+#### Default Applications
+
+- [ ] Changing the default terminal affects Super-T shortcut.
+
+#### X11 Applications Compatibility
+
+- [ ] Global Shortcuts in X11 Applications works (in e.g. Discord).
+
+### Time & Language
+
+#### Date & Time
+
+- [ ] Changing time zome works.
+- [ ] Toggling 24-hour time takes effect in Settings preview, on top panel, and on the lock screen.
+- [ ] Toggling seconds takes effect in Settings preview and on top panel.
+- [ ] Changing first day of week takes effect in Calendar applet.
+- [ ] Turning date on/off for applet works.
+
+### System & Accounts
+
+#### About
+
+- [ ] Changing hostname works (check terminal prompt).