* add issues document

* add documentation coding style to doc

* copyediting

* replace `nodejs/node` with `electron/electron`
* fix commasplice
* fix two most important... s/is/are/
* omit unnecessary words

* add pull requests doc

* copyediting

* add general code style to styleguide

* updates to CONTRIBUTING.md

* copyediting

* mark shell blocks as ```sh
* mitigate phrase duplication e.g. 'best practice'
* lots of opinionated changes to omit unnecessary words

* fix numbering & re-apply changes that I overwrote