feat(solutions): add print-pyramid/cs/function

challenges/print-pyramid/solutions/cs/function/README.md

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+# print-pyramid/cs/function
+
+Created by [@Divlo](https://github.com/Divlo) on 21 September 2021.

challenges/print-pyramid/solutions/cs/function/Solution.cs

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+using System;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            string pyramidType = Console.ReadLine();
+            int pyramidHeight = int.Parse(Console.ReadLine());
+            PrintPyramid(pyramidType, pyramidHeight);
+        }
+
+        public static void PrintPyramid(string type, int height)
+        {
+            int step = type == "normal" ? 1 : height;
+            while ((type == "normal" && step <= height) || (type == "reverse" && step != 0))
+            {
+                int numberOfStars = (step * 2) - 1;
+                int totalNumberOfLocations = (height * 2) - 1;
+                int totalNumberOfSpaces = totalNumberOfLocations - numberOfStars;
+                int numberOfSpacesOnEachSide = totalNumberOfSpaces / 2;
+                PrintCharacter(' ', numberOfSpacesOnEachSide);
+                PrintCharacter('*', numberOfStars);
+                PrintCharacter(' ', numberOfSpacesOnEachSide);
+                Console.Write('\n');
+                step = type == "normal" ? step + 1 : step - 1;
+            }
+        }
+
+        public static void PrintCharacter(char character, int numberOfTimes)
+        {
+            for (int iteration = 0; iteration < numberOfTimes; iteration++)
+            {
+                Console.Write(character);
+            }
+        }
+    }
+}