fix(guide): simplify directory structure

guide/chinese/csharp/do-while-loop/index.md

@@ -0,0 +1,40 @@
+---
+title: Do while loop
+localeTitle: 做循环
+---
+# 做循环
+
+`do while`循环执行一次代码块，直到条件为假。它们是[`while`循环的](https://guide.freecodecamp.org/csharp/while-loop)一个特例：它们执行一次代码块，然后直到条件为假。 `do while`循环的常见用法是输入检查。
+
+## 例
+```
+do 
+ { 
+    //execute code block 
+ 
+ 
+ } while(boolean expression); 
+ 
+ 
+ string input = ""; 
+ do 
+ { 
+    Console.WriteLine("Type A to continue: "); 
+    input = Console.ReadLine(); 
+ } while(input != "A"); 
+ 
+ Console.WriteLine("Bye!"); 
+```
+
+## 输出：
+```
+> Type A to continue: b 
+ > Type A to continue: g 
+ > Type A to continue: A 
+ > Bye! 
+```
+
+#### 更多信息：
+
+*   [微软C＃ - 做](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/do)
+*   [Dot Net Perls - 做](https://www.dotnetperls.com/do)