feat(solutions): add fizzbuzz/cs/function

challenges/fizzbuzz/solutions/cs/function/README.md

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+# fizzbuzz/cs/function
+
+Created by [@Divlo](https://github.com/Divlo) on 10 September 2021.

challenges/fizzbuzz/solutions/cs/function/Solution.cs

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+using System;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            int total = int.Parse(Console.ReadLine());
+            for (int number = 1; number <= total; number++)
+            {
+                bool isDivisibleBy3 = number % 3 == 0;
+                bool isDivisibleBy5 = number % 5 == 0;
+                if (isDivisibleBy3 && isDivisibleBy5)
+                {
+                    Console.WriteLine("FizzBuzz");
+                }
+                else if (isDivisibleBy3)
+                {
+                    Console.WriteLine("Fizz");
+                }
+                else if (isDivisibleBy5)
+                {
+                    Console.WriteLine("Buzz");
+                }
+                else
+                {
+                    Console.WriteLine(number);
+                }
+            }
+        }
+    }
+}