add Programmyday form github

EvenOrOddExtention/Program.cs

@@ -0,0 +1,22 @@
+namespace EvenOrOddExtention
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            int input = 105;
+            Console.WriteLine(input.EvenOrOdd());
+        }
+    }
+    static class EvenOrOddExtention
+    {
+        public static string EvenOrOdd(this int input)
+        {
+            if (input % 2 != 0)
+            {
+                return "Odd";
+            }
+            return "Even";
+        }
+    }
+}