add tinytex.R

[AmeliaMN]

I like being able to start up a package and then use the ? to jump into the documentation,

?tinytex

but that requires a .R file of the same name as the package (e.g., dplyr.R). Adding this would probably be a good beginner issue!

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[yihui]

Done. Thanks for the suggestion!

BTW, the .R file doesn't have to be of the same name as the package. A string "_PACKAGE" in the roxygen doc is enough, and everything else can be automatically generated from the package DESCRIPTION.