Add import order configuration to editorconfig

Fixes #486

Author: vlsi

Diff for: .editorconfig

@@ -11,3 +11,8 @@ charset = utf-8
 [*.md]
 indent_style = space
 indent_size = 2
+
+[*.java]
+# Doc: https://youtrack.jetbrains.com/issue/IDEA-170643#focus=streamItem-27-3708697.0-0
+ij_java_imports_layout = java.**,|,javax.**,|,org.**,|,com.**,|,com.diffplug.**,|,*
+ij_java_use_single_class_imports = true

Diff for: CHANGES.md

@@ -23,6 +23,7 @@ You might be looking for:
 * Visualize \r and \n as ␍ and ␊ when possible ([#465](https://github.com/diffplug/spotless/pull/465))
 * Make end-of-lines visible when file contains whitespace and end-of-line issues at the same time ([#465](https://github.com/diffplug/spotless/pull/465))
 * Print actual diff line instead of "1 more lines that didn't fit" ([#467](https://github.com/diffplug/spotless/issues/467))
+* Automatically configure import order for IntelliJ IDEA with `.editorconfig` ([#486](https://github.com/diffplug/spotless/issues/486))
 
 ### Version 1.25.0 - October 6th 2019 (javadoc [lib](https://diffplug.github.io/spotless/javadoc/spotless-lib/1.25.0/) [lib-extra](https://diffplug.github.io/spotless/javadoc/spotless-lib-extra/1.25.0/), artifact [lib]([jcenter](https://bintray.com/diffplug/opensource/spotless-lib), [lib-extra]([jcenter](https://bintray.com/diffplug/opensource/spotless-lib-extra)))