Added listing descendant items.

devops.py

@@ -229,10 +229,27 @@ class Item(DevOps):
             get_url=f"{self._repository._project.id}/_apis/git/repositories/{self._repository.id}/items",
             params={
                 "path": self._path,
-                "$format": "json"
+                "$format": "json",
+                "recursionLevel": "none"
             }
         )
 
     @property
     def path(self):
         return self._path
+
+    @property
+    def children(self):
+        """List items under this item if it is a folder."""
+        if self.git_object_type == "tree":
+            return self._entities(
+                entity_class=Item,
+                key_name="path",
+                list_url=f"{self._repository._project.id}/_apis/git/repositories/{self._repository.id}/items",
+                params={
+                    "scopePath": self._path,
+                    "recursionLevel": "oneLevel"
+                }
+            )
+        else:
+            raise ValueError("Items can only be listed for folder items.")