Added Bottom Sheet demo

src/Bottom Sheet/main.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Adw.Bin {
+  Adw.BottomSheet bottom_sheet {
+    bottom-bar: Label {
+      label: "Bottom Bar";
+      margin-bottom: 12;
+      margin-end: 12;
+      margin-start: 12;
+      margin-top: 12;
+    };
+
+    content: Adw.StatusPage {
+      child: Box {
+        orientation: vertical;
+        spacing: 12;
+        halign: center;
+        LinkButton {
+          label: _("API Reference");
+          uri: "https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.BottomSheet.html";
+        }
+        Adw.Clamp {
+          child: Adw.PreferencesGroup {
+            Adw.SwitchRow {
+              active: bind bottom_sheet.full-width bidirectional;
+              title: "Full Width";
+            }
+
+            Adw.SwitchRow {
+              active: bind bottom_sheet.can-open bidirectional;
+              title: "Can Open";
+            }
+
+            Adw.SwitchRow {
+              active: bind bottom_sheet.open bidirectional;
+              title: "Open";
+            }
+          };
+        }
+      };
+
+      description: "Display content with a bottom sheet";
+      title: "Bottom Sheet";
+    };
+
+    sheet: Adw.StatusPage {
+      width-request: 360;
+
+      child: Adw.Clamp {
+        child: Adw.PreferencesGroup {
+          Adw.SwitchRow {
+            active: bind bottom_sheet.can-close bidirectional;
+            title: "Can Close";
+          }
+
+          Adw.SwitchRow {
+            active: bind bottom_sheet.show-drag-handle bidirectional;
+            title: "Show Drag Handle";
+          }
+
+          Adw.SwitchRow {
+            active: bind bottom_sheet.modal bidirectional;
+            title: "Modal";
+          }
+        };
+      };
+
+      title: "Sheet";
+    };
+  }
+}

src/Bottom Sheet/main.json

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+{
+  "category": "layout",
+  "description": "Display content with a bottom sheet",
+  "panels": ["ui", "preview"],
+  "autorun": true
+}