added install.R. runtime.txt, and R notebook

[abernauer]

1. Added the R notebook
2. Updated the binder directory with a runtime.txt file containing the R version.
3. Updated the binder directory with a install.R file with packages to install.

[mlpack-bot[bot]]

Thanks for opening your first pull request in this repository! Someone will review it when they have a chance. In the mean time, please be sure that you've handled the following things, to make the review process quicker and easier:

• All code should follow the style guide
• Documentation added for any new functionality
• Tests added for any new functionality
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[birm]

If unintentional, this works towards #97. :1st_place_medal: This is awesome, but I don't feel I can give an approval since I learned exactly enough R to marginally pass assignments where it was needed :upside_down_face:

[abernauer]

@birm Yes sort of unintentional. Though I had fun writing the example and would love to adapt some of the other examples for the R bindings.

[abernauer]

Pushed the commit addressing the comments by @zoq :smile:

[rcurtin]

Hey @abernauer, thanks for taking the time to implement this! It looks great. I left a bunch of comments through ReviewNB; hopefully they're helpful. I do have some slight (but not serious) concern about the CF model itself; I wonder if we need to tune it with different parameters so that the movies it shows are more common. Probably the rank parameter is what would need to be tuned. Maybe worth a shot to see what happens and if the results look qualitatively better or worse? :+1:

[shrit]

@abernauer this is nice work, but I will have to close this PR, we did a major refactoring of this repository and I would doubt that it will be easy to solve all the merge conflicts. Therefore, if you are still interested feel free to open this PR again.