add Programmyday form github

Warenkorb/Article.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Warenkorb
+{
+    abstract class Article
+    {
+        private int articleNumber;
+        private double price;
+        public Article(int articleNumber, double price)
+        {
+            this.articleNumber = articleNumber;
+            this.price = price;
+        }
+        public virtual double GetPrice()
+        {
+            return this.price;
+        }
+        public virtual int GetarticleNumber()
+        {
+            return this.articleNumber;
+        }
+        public virtual void PrintInfo()
+        {
+            Console.WriteLine($"Artikelnummer:          {GetarticleNumber()}");
+            Console.WriteLine($"Nettopreis:             {this.price:C2}");
+        }
+}
+}