Style guide

[jhtu]

Make a style guide for future developers.

[jhtu]

Moved from old todo.txt.

[belson17]

Will the 80 character limit live on from punchcards?! https://softwareengineering.stackexchange.com/questions/148677/why-is-80-characters-the-standard-limit-for-code-width

[jhtu]

Fair to question whether or not an 80-character limit is outdated. More generally, is it useful to have any fixed page width? This perhaps suggests that it could be:
https://softwareengineering.stackexchange.com/a/222998

[jhtu]

Here are some discussions from the web-design world, which is nice because it is separate from the history of coding/punchcards, and focuses on readability instead:

https://www.smashingmagazine.com/2014/09/balancing-line-length-font-size-responsive-web-design/

https://baymard.com/blog/line-length-readability