What R Markdown is: Markdown is a lightweight markup language with plain text formatting syntax. It is designed so that it can be converted to HTML and many other formats using a tool by the same name. Wikipedia
PDF files can be created with MikTex (a LaTeX program) and Word documents can also be created , provided the user has Word installed on their machine.
Links below are some files and examples of Markdown files, both code used and the finished product, and some miscellaneous help files and links.