增加跨IDE代码格式配置

Author: cmpan

.editorconfig

@@ -0,0 +1,14 @@
+# editorconfig.org
+# doc: https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false