Added Pandoctor style

This style offers a clean, double spaced, serifed text with readable margins. It is meant to nearly precisely mimic the .docx output if one uses my `reference.docx` file with pandoc when converting from MD to DOCX (for more info, see [here](https://github.com/smargh/pandoc-templates)). Thus, this style allows you to see what your final .docx will look like, without having to constantly generate the file and view it.