add sheet to add exercises

WorkoutsPlus/ExerciseDetailsView.swift

@@ -0,0 +1,62 @@
+//
+//  ExerciseDetailsView.swift
+//  WorkoutsPlus
+//
+//  Created by Felix Förtsch on 10.08.24.
+//
+
+import SwiftUI
+
+struct ExerciseDetailsView: View {
+		@Environment(\.dismiss) private var dismiss
+		@Environment(\.modelContext) private var modelContext
+		
+		@Binding var exercise: Exercise?
+		var isEditing: Bool
+		
+		var body: some View {
+				NavigationView {
+						Form {
+								TextField("Exercise Name", text: Binding(
+										get: { exercise?.name ?? "" },
+										set: { newName in
+												if exercise != nil {
+														exercise?.name = newName
+												}
+										}
+								))
+						}
+						.navigationTitle(isEditing ? "Edit Exercise" : "Add Exercise")
+						.toolbar {
+								ToolbarItem(placement: .navigationBarLeading) {
+										Button("Cancel") {
+												dismiss()
+										}
+								}
+								ToolbarItem(placement: .navigationBarTrailing) {
+										Button("Save") {
+												saveItem()
+												dismiss()
+										}
+								}
+						}
+				}
+		}
+		
+		private func saveItem() {
+				if modelContext.hasChanges {
+						do {
+								try modelContext.save()
+						} catch {
+								print("Failed to save item: \(error.localizedDescription)")
+						}
+				}
+		}
+}
+
+struct ExerciseDetailsView_Previews: PreviewProvider {
+		static var previews: some View {
+				let sampleItem = Exercise(name: "Sample Item")
+				ExerciseDetailsView(exercise: .constant(sampleItem), isEditing: false)
+		}
+}