Hi Yassine,
Like Paul said we are not certified yet. If you want to use Studio 2013 you need to manually register the provider. Even if you manually register it, please note that the EF6 does not work well with our provider as of yet. There is a request already to get certified with EF6.
Please read this other blog to manually register the provider with Studio 2013. http://scn.sap.com/message/15619716#15619716
http://scn.sap.com/message/15563805#15563805
You will notice the directory say 11 in the above link you need to change it to 12 for Studio 2013.
Thanks,
Dawn Kim