Add .editorconfig file

.editorconfig

@@ -0,0 +1,18 @@
+# WordPress Coding Standards
+# https://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
+
+[{.babelrc,.eslintrc,.jshintrc,*.json,*.yml}]
+indent_style = space
+indent_size = 2
+
+[{*.md}]
+trim_trailing_whitespace = false