chore: add editorconfig

Author: andelf

.editorconfig

@@ -0,0 +1,19 @@
+root = true
+[*]
+indent_style=space
+indent_size=4
+tab_width=4
+end_of_line=lf
+charset=utf-8
+trim_trailing_whitespace=true
+max_line_length=120
+insert_final_newline=true
+
+[*.yml]
+indent_style=space
+indent_size=4
+tab_width=8
+end_of_line=lf
+
+[*.md]
+indent_size = 2