Add .editorconfig file so IDEs automatically perform common normalizing rules

[vlsi]

What feature do you want to see added?

.editorconfig enables configuring settings that are recognized across several IDEs.

For instance:

• trim_trailing_whitespace = true (it should be false for markdown files by the way)
• insert_final_newline = true
• indent_style = space

See https://github.com/pgjdbc/pgjdbc/blob/master/.editorconfig

Upstream changes

No response

Are you interested in contributing this feature?

No response