add editorconfig

Author: crepererum

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+
+[{*.rs,*.toml}]
+indent_size = 4