Add t-SNE to wikirec about wikirec

[andrewtavis]

@victle, will write to you about this here :) You'd be welcome to work on this as well if you're interested! I honestly think that the kwx implementation of TFIDF would be good enough to copy over, but then you'd be welcome to look into other resources and make improvements (I'd then use them in kwx no doubt).

A question would be how the package structure would change. In kwx I have kwx.visuals, so would we want to do a wikirec.visuals module? And if so, should graph_lda_topic_evals be moved into there from wikirec.utils?

[victle]

I'll try to go through that implementation and get a better understanding first. Any resources you have besides kwx would be appreciated! I like the idea of having a wikirec.visuals module—keeps everything nice and tidy.

[andrewtavis]

Sounds great :) I just updated the wiki just now with some useful resources on t-SNE 😊

Feel free to split off the module yourself in the PR. Thanks for this!