Initial data commit

Task/Arithmetic-Complex/C-sharp/arithmetic-complex-1.cs

@@ -0,0 +1,17 @@
+namespace RosettaCode.Arithmetic.Complex
+{
+    using System;
+    using System.Numerics;
+
+    internal static class Program
+    {
+        private static void Main()
+        {
+            var number = Complex.ImaginaryOne;
+            foreach (var result in new[] { number + number, number * number, -number, 1 / number, Complex.Conjugate(number) })
+            {
+                Console.WriteLine(result);
+            }
+        }
+    }
+}