Adds minimal metadata for .Rmd.

Shortens description for data/ directory.

Sets project and figure paths for knitr.

Adds gitignore patterns for R projects.

Adds reference to format spec.

Fixes syntax errors.

Adds template datapackage.json metadata descriptor.

Clarifies that raw data are not to be duplicated.

Annotates directory structure

Adds top-level Makefile as an alternative.

Correct extension for top-level Rmarkdown.

Goals and concepts behind developing this.

Clarify credit to Noble 2009.

Adds URL for this repo.

Adds CC0 disclaimer and delete instruction for license.