Add build scripts for C# and

unify the coding style.

docs/chapter_sorting/insertion_sort.md

@@ -98,22 +98,7 @@ comments: true
 === "C#"
 
     ```csharp title="insertion_sort.cs"
-    /* 插入排序 */
-    void insertionSort(int[] nums)
-    {
-        // 外循环：base = nums[1], nums[2], ..., nums[n-1]
-        for (int i = 1; i < nums.Length; i++)
-        {
-            int bas = nums[i], j = i - 1;
-            // 内循环：将 base 插入到左边的正确位置
-            while (j >= 0 && nums[j] > bas)
-            {
-                nums[j + 1] = nums[j]; // 1. 将 nums[j] 向右移动一位
-                j--;
-            }
-            nums[j + 1] = bas;         // 2. 将 base 赋值到正确位置
-        }
-    }
+    [class]{insertion_sort}-[func]{insertionSort}
     ```
 
 === "Swift"