Add mWDN to the library

[holderhe]

add mWND to this lib please, refer to https://github.com/chenfei0328/mWDN-RCF as a good helper.

[wuhaixu2016]

Hi, thanks for your recommendation. We will consider adding this model. It may take a long time since we have a large model list to implement. It will be better if you propose a pull request, which can speed up this process.