Add: Include basic .editorconfig file to help enforce tab style (#6707)

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{c,cpp,h,hpp}]
+indent_style = tab
+charset = utf-8