Add Button to present SettingsView in SidebarView

Shared/Navigation/SidebarView.swift

@@ -1,8 +1,30 @@
 import SwiftUI
 
 struct SidebarView: View {
+    @State var isPresentingSettings = false
+
     var body: some View {
+        #if os(iOS)
+        VStack {
+            CollectionListView()
+            Spacer()
+            Button(action: {
+                isPresentingSettings = true
+            }, label: {
+                Text("Settings")
+            }).sheet(
+                isPresented: $isPresentingSettings,
+                onDismiss: {
+                    isPresentingSettings = false
+                },
+                content: {
+                    SettingsView()
+                }
+            )
+        }
+        #else
         CollectionListView()
+        #endif
     }
 }