Add WKU Epi Game dataset files

[aoliveram]

Closes #69

Opening this draft PR to start integrating the Epigames datasets into netdiffuseR.
So far, I've only added the raw data files for the datasets we discussed. I will be pushing the parsing functions and documentation in the upcoming commits.

To-do list:
-[x] Add raw datasets (game 165).

• Add internal R routine to parse the frame-by-frame .mtx files into CsparseMatrix and diffnet objects.
• Update package documentation describing the new datasets.

I'll mark this as ready for review once the code and docs are complete!

[aoliveram]

The raw data and the data in diffnet format are now ready.

Remaining tasks before this PR is ready for review:

• Expand and improve the documentation to properly describe these new datasets.
• Review the nature of the networks (specifically, handling the binarization of weighted networks).
• Evaluate whether we should include the varnet (network variables). Currently commented: #netvars = c("qyes", "qno", "mask", "med"),

[gvegayon]

I don't see any R code yet, is that expected?

[aoliveram]

Yes, it's expected. All the code is in the repo epigames-analysis-recreation. I just sent an invitation if you want to have a look now. The repo is very similar to the one from Andres, but this one has the new notebook 1-data-parsing-R-format.ipynb, and the notebook 4-diffusion-analysis.Rmd has been updated to the WKU dataset (165).

If you run both, you should get the data you saw in the commit of this PR.

I'll be getting back to work soon.