Add a toolbar playground covering each placement

Author: colemancda

Demo/App.swiftpm/Sources/ToolbarPlaygrounds.swift

@@ -0,0 +1,41 @@
+#if canImport(AndroidSwiftUI)
+import AndroidSwiftUI
+#else
+import SwiftUI
+#endif
+
+struct ToolbarPlayground: View {
+
+    @State private var score = 0
+    @State private var principalTitle = false
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 12) {
+                Text("Score: \(score)")
+                Text("Save adds 1, Flag adds 10, the bottom action adds 100.")
+                Button(principalTitle ? "Use the plain title" : "Use a principal title") {
+                    principalTitle.toggle()
+                }
+            }
+            .padding()
+        }
+        .navigationTitle("Toolbar")
+        .toolbar {
+            ToolbarItem(placement: .navigationBarLeading) {
+                Button("Flag") { score += 10 }
+            }
+            ToolbarItem(placement: .navigationBarTrailing) {
+                Button("Save") { score += 1 }
+            }
+            if principalTitle {
+                ToolbarItem(placement: .principal) {
+                    Text("Principal")
+                }
+            }
+            ToolbarItem(placement: .bottomBar) {
+                Button("Bottom action") { score += 100 }
+            }
+        }
+    }
+}