Add EditorConfig to set some common style rules

Author: dragetd

.editorconfig

@@ -0,0 +1,149 @@
+# EditorConfig: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Default preferences
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# IDEA specific
+curly_bracket_next_line = false
+wildcard_import_limit = 0
+
+
+# Generic XML
+# https://google.github.io/styleguide/xmlstyle.html
+[*.xml]
+indent_size = 2
+indent_style = space
+
+# Maven
+# https://maven.apache.org/
+[pom.xml]
+indent_size = 4
+indent_style = space
+
+# Groovy (gradle)
+# ?
+[*.{groovy, gradle}]
+indent_size = 4
+indent_style = space
+
+# Bazel: https://bazel.build/
+# https://github.com/bazelbuild/buildtools/blob/master/BUILD.bazel
+[*.{bazel, bzl}]
+indent_size = 4
+indent_style = space
+
+# CSS
+# https://google.github.io/styleguide/htmlcssguide.xml#General_Formatting_Rules
+# http://cssguidelin.es/#syntax-and-formatting
+[*.css]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+
+# GNU make
+# https://www.gnu.org/software/make/manual/html_node/Recipe-Syntax.html
+[Makefile]
+indent_style = tab
+
+# Go
+# https://golang.org/cmd/gofmt/
+[{go.mod, *.go}]
+indent_style = tab
+
+# GraphQL
+# https://graphql.org/learn/
+# https://prettier.io
+[*.graphql]
+indent_size = 2
+indent_style = space
+
+# HTML
+# https://google.github.io/styleguide/htmlcssguide.xml#General_Formatting_Rules
+[*.{htm, html}]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+
+# Java
+# https://google.github.io/styleguide/javaguide.html#s4.2-block-indentation
+[*.java]
+indent_size = 2
+indent_style = space
+
+# JavaScript, JSON, JSX, JavaScript Modules, TypeScript
+# https://github.com/feross/standard
+# https://prettier.io
+# https://github.com/angular/angular-cli/blob/master/.editorconfig
+[*.{cjs, js, json, jsx, mjs, ts, tsx}]
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+quote_type = single
+
+
+# Kotlin (and gradle.kts)
+# https://android.github.io/kotlin-guides/style.html#indentation
+[*.{kt, kts}]
+indent_size = 4
+indent_style = space
+
+# LESS
+# https://github.com/less/less-docs#less-standards
+[*.less]
+indent_size = 2
+indent_style = space
+
+# PHP
+# http://www.php-fig.org/psr/psr-2/
+[*.php]
+indent_size = 4
+indent_style = space
+
+# Python
+# https://www.python.org/dev/peps/pep-0008/#code-lay-out
+[*.py]
+indent_size = 4
+indent_style = space
+
+# Ruby
+# http://www.caliban.org/ruby/rubyguide.shtml#indentation
+[*.rb]
+indent_size = 2
+indent_style = space
+
+# Rust
+# https://github.com/rust-lang/rust/blob/master/src/doc/style/style/whitespace.md
+[*.rs]
+indent_size = 4
+indent_style = space
+insert_final_newline = false
+trim_trailing_whitespace = true
+
+# SASS
+# https://sass-guidelin.es/#syntax--formatting
+[*.{sass, scss}]
+indent_size = 2
+indent_style = space
+
+# Shell
+# https://google.github.io/styleguide/shell.xml#Indentation
+[*.{bash, sh, zsh}]
+indent_size = 2
+indent_style = space
+
+# TOML
+# https://github.com/toml-lang/toml/tree/master/examples
+[*.toml]
+indent_size = 2
+indent_style = space
+
+# YAML
+# http://yaml.org/spec/1.2/2009-07-21/spec.html#id2576668
+[*.{yaml, yml}]
+indent_size = 2
+indent_style = space

CONTRIBUTING.md

@@ -1,5 +1,7 @@
 # Contributing
-When contributing to this repository, please first discuss the change you wish to make via issue.
+When contributing to this repository, please first discuss the change you wish to make via an issue.
+
+This project uses [EditorConfig](https://editorconfig.org) to set some style rules. If your IDE does not support it natively, please install [a plugin](https://editorconfig.org/#download).
 
 ## Learning
 Developer documentation may be found under `docs/dev/`.