Implement Driftwood AppImage manager

data/app.driftwood.Driftwood.gschema.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<schemalist gettext-domain="driftwood">
+  <schema id="app.driftwood.Driftwood" path="/app/driftwood/Driftwood/">
+    <key name="window-width" type="i">
+      <default>900</default>
+      <summary>Window width</summary>
+      <description>The width of the main application window.</description>
+    </key>
+    <key name="window-height" type="i">
+      <default>600</default>
+      <summary>Window height</summary>
+      <description>The height of the main application window.</description>
+    </key>
+    <key name="window-maximized" type="b">
+      <default>false</default>
+      <summary>Window maximized</summary>
+      <description>Whether the main application window is maximized.</description>
+    </key>
+    <key name="scan-directories" type="as">
+      <default>['~/Applications', '~/Downloads']</default>
+      <summary>Scan directories</summary>
+      <description>Directories to scan for AppImage files.</description>
+    </key>
+    <key name="view-mode" type="s">
+      <default>'grid'</default>
+      <summary>Library view mode</summary>
+      <description>The library view mode: grid or list.</description>
+    </key>
+    <key name="color-scheme" type="s">
+      <default>'default'</default>
+      <summary>Color scheme</summary>
+      <description>Application color scheme: default (follow system), force-light, or force-dark.</description>
+    </key>
+  </schema>
+</schemalist>