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

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

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

challenges/sorting-algorithms/solutions/cs/bubble-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 = BubbleSort(numbers.ToArray());
+            foreach (int number in result)
+            {
+                Console.WriteLine(number);
+            }
+        }
+
+        public static int[] BubbleSort(int[] array)
+        {
+            for (int index1 = 0; index1 < array.Length; index1++)
+            {
+                for (int index2 = 0; index2 < array.Length - 1; index2++)
+                {
+                    if (array[index2] > array[index2 + 1])
+                    {
+                        int temporary = array[index2];
+                        array[index2] = array[index2 + 1];
+                        array[index2 + 1] = temporary;
+                    }
+                }
+            }
+            return array;
+        }
+    }
+}