Add .editorconfig

[findepi]

No description provided.

[findepi]

Currently my IntelliJ ignores indent_size for .sh files (it works for .java), so we still need airlift/codestyle#9

[electrum]

Why do we need this? Is this for IntelliJ (and if so does code style not cover it) or something else?

[findepi]

For IntelliJ.

• insert_final_newline -- it is something that code style doesn't configure
• charset, end_of_line -- maybe we don't need to add this, as intellij auto-detects this from pom
• in the future we can add more configuration here -- this is not going to replace https://github.com/airlift/codestyle, but this can offer better out-of-the-box experience. (Or, maybe there is an option to let Intellij auto-import https://github.com/airlift/codestyle? currently people need to do this manually)

[electrum]

We could add this as well:

[*]
trim_trailing_whitespace = true
indent_style = space
indent_size = 4

[*.md]
trim_trailing_whitespace = false

I don't think we use a different indent size elsewhere, but we could override if we do.

[findepi]

AC