code: public BoxFolder.Info createFolder(String name) {
          JsonObject parent = new JsonObject();
          parent.add("id", this.getID());
  
          JsonObject newFolder = new JsonObject();
          newFolder.add("name", name);
          newFolder.add("parent", parent);
  
          BoxJSONRequest request = new BoxJSONRequest(this.getAPI(), CREATE_FOLDER_URL.build(this.getAPI().getBaseURL()),
                  "POST");
          request.setBody(newFolder.toString());
          BoxJSONResponse response = (BoxJSONResponse) request.send();
          JsonObject responseJSON = JsonObject.readFrom(response.getJSON());
  
          BoxFolder createdFolder = new BoxFolder(this.getAPI(), responseJSON.get("id").asString());
          return createdFolder.new Info(responseJSON);
      }
docs: Creates a new child folder inside this folder.
  
  @param name the new folder's name.
  @return the created folder's info.