Add linting reminder line in root README

src/README.md

@@ -3,4 +3,6 @@ The source codebase for the entire project and its comprising components can be
 
 - `data_preprocess/` holds the scripts used to preprocess (clean, format, etc.) the raw message data before using it to finetune the language model
 - `misc/` holds the code for miscellaneous features developed as part of the project (for instance word clouds generated from the clean data)
-- `model/` holds the codebase for the language model architecture, finetuning process and other necessary features
+- `model/` holds the codebase for the language model architecture, finetuning process and other necessary features
+
+The Python codebase is formatted and indented using the `isort` and `black` packages.