* [smalldet visdrone] add modle zoo

* delete

* [smdet] add visdrone sliced config

* fix visdrone smalldet doc, test=document_fix

* [smalldet]add xview sliced config

* [smalldet] add Dota and xview config

* [smalldet] add xview and dota config

* [smalldet] fix path of weight

* [smalldet] add readme