fix(guide): simplify directory structure

guide/english/csharp/foreach/index.md

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+---
+title: Foreach Loop
+---
+
+## Foreach Loop
+
+The `foreach` loop executes a block of code for each item in a collection. The benefit of the `foreach` loop is you need not know how many items are within the collection to iterate through it; you simply tell your `foreach` loop to loop through the collection, as long as there are items within it. It is useful for iterating through lists, arrays, datatables, IEnumerables and other list-like data structures. It can be less efficient than a very well designed `for` loop, but the difference is negligible in most cases.
+
+### Example
+```csharp
+
+foreach (element in iterable-item)
+{
+    // body of foreach loop
+}
+
+List<string> Names = new List<string>{ "Jim", "Jane", "Jack" }
+
+foreach(string name in Names)
+{
+    Console.WriteLine("We have " + name);    
+}
+```
+
+### Output:
+```sh
+> We have Jim
+> We have Jane
+> We have Jack
+```