✨ add guide for NSQuitAlwaysKeepsWindow setting (#399)

Co-authored-by: Yann Bertrand <5855339+yannbertrand@users.noreply.github.com>

docs/misc/nsquitalwayskeepwindows.md

@@ -0,0 +1,59 @@
+---
+title: Keep windows when quitting an application | Miscellaneous
+description: When enabled, open documents and windows will be restored when you re-open an application.
+head:
+  - - meta
+    - property: 'og:title'
+      content: macOS defaults > Miscellaneous > Keep windows when quitting an application
+  - - meta
+    - property: 'og:description'
+      content: When enabled, open documents and windows will be restored when you re-open an application.
+---
+
+# Keep windows when quitting an application
+
+When enabled, open documents and windows will be restored when you re-open an application.
+
+⚠️ Restarting the Mac or closing the session is necessary to take the changes into effect.
+
+- **Tested on macOS**:
+  - Sequoia
+- **Parameter type**: bool
+
+## Set to `true` (default value)
+
+Keep windows when quitting an application.
+Open documents and windows will be restored when you re-open an application.
+
+```bash
+defaults write NSGlobalDomain "NSQuitAlwaysKeepsWindow" -bool "true"
+```
+
+## Set to `false`
+
+Close windows when quitting an application.
+Open documents and windows will not be restored when you re-open an application.
+
+```bash
+defaults write NSGlobalDomain "NSQuitAlwaysKeepsWindow" -bool "false"
+```
+
+## Read current value
+
+```bash
+defaults read NSGlobalDomain "NSQuitAlwaysKeepsWindow"
+```
+
+## Reset to default value
+
+```bash
+defaults delete NSGlobalDomain "NSQuitAlwaysKeepsWindow"
+```
+
+## Set value from UI
+
+This setting is the inverse of the following option accessible through
+System Preferences.
+
+1. Open the <a href="x-apple.systempreferences:com.apple.preference.dock?Windows">Desktop & Dock preference pane in System Preferences</a>.
+2. Toggle "Close windows when quitting an application".