add 增加代码格式化规范配置

.editorconfig

@@ -0,0 +1,18 @@
+# http://editorconfig.org
+root = true
+
+# 空格替代Tab缩进在各种编辑工具下效果一致
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{json,yml}]
+indent_size = 2
+
+[*.md]
+insert_final_newline = false
+trim_trailing_whitespace = false