Add a disclosure group playground

Author: colemancda

Demo/App.swiftpm/Sources/DisclosurePlaygrounds.swift

@@ -0,0 +1,43 @@
+#if canImport(AndroidSwiftUI)
+import AndroidSwiftUI
+#else
+import SwiftUI
+#endif
+
+struct DisclosurePlayground: View {
+
+    @State private var advancedOpen = false
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 0) {
+                Example("Self-managed expansion") {
+                    DisclosureGroup("What's included") {
+                        Text("• Unlimited projects")
+                        Text("• Priority support")
+                        Text("• Early access")
+                    }
+                }
+                Example("Bound expansion") {
+                    VStack(alignment: .leading, spacing: 8) {
+                        DisclosureGroup("Advanced settings", isExpanded: $advancedOpen) {
+                            Text("Experimental features live here.")
+                            Toggle("Beta channel", isOn: .constant(true))
+                        }
+                        Button(advancedOpen ? "Collapse from outside" : "Expand from outside") {
+                            advancedOpen.toggle()
+                        }
+                    }
+                }
+                Example("With a Label header") {
+                    DisclosureGroup(content: {
+                        Text("Grouped under a labeled header.")
+                    }, label: {
+                        Label("Notifications", systemImage: "star.fill")
+                    })
+                }
+            }
+        }
+        .navigationTitle("DisclosureGroup")
+    }
+}