Create a Windows Forms application for Mats-R-Us Retailer. The app will determine the cost of a purchase based on amat type, color & whether or not it is foldable. .a. Draw a sketch of an appropriate interface. Be sure to follow the GUI design guidelines in the file(ProjectGuideline-Standards.pdf).b. If you want to include an image in the interface, you can use your own image.c. Prepare the following design specifications; Planning Chart and (pseudocode or flowchart.)d. Create a Windows Forms ap