feat: Add editorconfig settings from core webpack

In order to have a consistent style on the
projects of webpack, we are using for the cli the
settings that are used also in webpack.

.editorconfig

@@ -0,0 +1,23 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 233
+
+[*.json]
+indent_style = space
+indent_size = 2
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[test/cases/parsing/bom/bomfile.{css,js}]
+charset = utf-8-bom
+
+[*.md]
+trim_trailing_whitespace = false