Based on the instructions created by Gary Simon for coursetro.com found at: https://coursetro.com/posts/design/72/Installing-Bootstrap-4-Tutorial
NPM and Gulp
Navigate to where you would like to place the code and paste the following into terminal
git clone https://github.com/rachy/bootstrap-4-sass.git
in your project directory run gulp
sass files are located in: src > scss
js files are located in: src > js
Currently, jQuery.min, tether.min, and bootstrap.min are being loaded in the js folder. Links to these files have not been added to index.html