build: editorconfig추가

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*.{kt,kts}]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 130
+tab_width = 4
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true