feat(solutions): add sorting-algorithms/cs/insertion-sort

challenges/sorting-algorithms/solutions/cs/insertion-sort/README.md

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+# sorting-algorithms/cs/insertion-sort
+
+Created by [@Divlo](https://github.com/Divlo) on 11 September 2021.

challenges/sorting-algorithms/solutions/cs/insertion-sort/Solution.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            string line = Console.ReadLine();
+            List<int> numbers = new List<int>();
+            while ((line = Console.ReadLine()) != null)
+            {
+                numbers.Add(int.Parse(line));
+            }
+            int[] result = InsertionSort(numbers.ToArray());
+            foreach (int number in result)
+            {
+                Console.WriteLine(number);
+            }
+        }
+
+        public static int[] InsertionSort(int[] array)
+        {
+            for (int index1 = 1; index1 < array.Length; index1++)
+            {
+                int index2 = index1;
+                while (index2 > 0 && array[index2 - 1] > array[index2])
+                {
+                    int temporary = array[index2];
+                    array[index2] = array[index2 - 1];
+                    array[index2 - 1] = temporary;
+                    index2--;
+                }
+            }
+            return array;
+        }
+    }
+}