add Programmyday form github

Stringaufgabe1/CharString.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Stringaufgabe1
+{
+    internal class CharString
+    {
+        private string? _string;
+        private int _index;
+        public int CountCharInString(string s, char c)
+        {
+            this._string = s;
+            this._index = _string.Split(c).Length -1;
+            return _index;
+        }
+        public void PrintInfo()
+        {
+            Console.WriteLine($"Vorkommende Anzahl: {this._index}");
+        }
+    }
+}