Add BubbleSort in Dart Language

Author: ALaurinne

classical_algorithms/dart/BubbleSort.dart

@@ -0,0 +1,20 @@
+void main() {
+  List<int> array = <int>[10, -4, 7, 3, 1, 0, 2, 6, 99];
+  BubbleSort(array);
+
+  for (int i = 0; i < array.length - 1; i++) print(array[i]);
+}
+
+List<int> BubbleSort(List<int> list) {
+  print("Bubble Sort: ");
+  for (int i = 0; i < list.length; i++) {
+    for (int j = 0; j < list.length - 1; j++) {
+      if (list[j] > list[j + 1]) {
+        int num = list[j];
+        list[j] = list[j + 1];
+        list[j + 1] = num;
+      }
+    }
+  }
+  return list;
+}

readme.md

@@ -31,6 +31,11 @@ Code | Test
 [Quick Sort](https://github.com/larissalages/code_problems/blob/master/classical_algorithms/java/QuickSort.java) | Missing tests
 [Bubble Sort](https://github.com/larissalages/code_problems/blob/master/classical_algorithms/java/BubbleSort.java) | Missing tests
 
+### Dart
+Code | Test
+------------ | -------------
+[Bubble Sort](https://github.com/larissalages/code_problems/blob/master/classical_algorithms/dart/BubbleSort.dart) | Missing tests
+
 ### C++
 Code | Test
 ------------ | -------------