feat(solutions): add look-and-say-sequence-conway/cs/function

challenges/look-and-say-sequence-conway/solutions/cs/function/README.md

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+# look-and-say-sequence-conway/cs/function
+
+Created by [@Divlo](https://github.com/Divlo) on 30 November 2021.

challenges/look-and-say-sequence-conway/solutions/cs/function/Solution.cs

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+using System;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            string line = Console.ReadLine();
+            string result = "";
+            for (int index = 0; index < line.Length; index++)
+            {
+                int numberOfAppearances = 0;
+                char valueToSearch = line[index];
+                int iteration = index;
+                while (iteration < line.Length && line[iteration] == valueToSearch)
+                {
+                    numberOfAppearances += 1;
+                    iteration++;
+                }
+                result = result + numberOfAppearances.ToString() + line[index];
+                index += numberOfAppearances - 1;
+            }
+            Console.WriteLine(result);
+        }
+    }
+}