Add EditorConfig support for consistent IDE styling

[JoshuaLicense]

Description

Add EditorConfig for consistent styling across IDEs (decoupling from VSCode).

Also adds config so that VSCode will recommend ESLint + EditorConfig extensions in VSCode (to be a better transition). JetBeans has EditorConfig natively included in most flavours.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] Feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have added tests that prove my fix is effective or that my feature works

[sdh100shaun]

TIL .. not come across this but looks good to me