Add .editorconfig file, see http://editorconfig.org/.

"EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs."

props jorbin, netweb.
fixes #26429.


git-svn-id: https://develop.svn.wordpress.org/trunk@27198 602fd350-edb4-49c9-b593-d223f7449a82

.editorconfig

@@ -0,0 +1,21 @@
+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# http://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[*.json]
+indent_style = space
+indent_size = 2
+
+[*.txt,wp-config-sample.php]
+end_of_line = crlf