Add Welcome screen

Shared/Views/OpenSettingsButton.swift

@@ -0,0 +1,27 @@
+import SwiftUI
+
+struct OpenSettingsButton: View {
+    @Environment(\.dismiss) private var dismiss
+    @EnvironmentObject<NavigationModel> private var navigation
+
+    var body: some View {
+        Button {
+            dismiss()
+
+            #if os(macOS)
+                NSApp.sendAction(Selector(("showPreferencesWindow:")), to: nil, from: nil)
+            #else
+                navigation.presentingSettings = true
+            #endif
+        } label: {
+            Label("Open Settings", systemImage: "gearshape.2")
+        }
+        .buttonStyle(.borderedProminent)
+    }
+}
+
+struct OpenSettingsButton_Previews: PreviewProvider {
+    static var previews: some View {
+        OpenSettingsButton()
+    }
+}