add Programmyday form github

SplitCharsIntoCountExtentions/Program.cs

@@ -0,0 +1,28 @@
+using System.Diagnostics.Metrics;
+
+namespace SplitCharsIntoCountExtentions
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string input = "a";
+            Console.WriteLine($"Word count: {input.CharCount('a')}");
+        }
+    }
+    static class CharCountExtension
+    {
+        public static int CharCount(this string input, char letter)
+        {
+            int counter = 0;
+            foreach (var item in input)
+            {
+                if (item == letter)
+                {
+                    counter++;
+                }
+            }
+            return counter;
+        }
+    }
+}