feat(solutions): add camel-case/cs/function

challenges/camel-case/solutions/cs/function/README.md

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+# camel-case/cs/function
+
+Created by [@Divlo](https://github.com/Divlo) on 8 September 2021.

challenges/camel-case/solutions/cs/function/Solution.cs

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+using System;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            string[] words = Console.ReadLine().ToLower().Trim().Split(" ");
+            string result = words[0];
+            for (int index = 1; index < words.Length; index++)
+            {
+                var word = words[index];
+                result += word[0].ToString().ToUpper() + word.Substring(1);
+            }
+            Console.WriteLine(result);
+        }
+    }
+}