Update README.md

data_processing/scripts/README.md

-The structure of the scripts in this folder
+The scripts in this folder are organized as follows:
+
+*  download_files.py: Contains functions for downloading and decompressing the files needed for analysis.
+*  download_files.ipynb: Jupyter notebook that applies the download functions to retrieve and decompress the files used for analysis.
+*  preprocess_functions.py: Contains functions for preprocessing and filtering the data from the files.
+*  insert_tables.py: Contains functions for inserting tables into the MySQL database.
+*  preprocess_upload_data.ipynb:  Jupyter notebook that preprocesses annotations and inserts all tables into the MySQL database.
+*  gpl_main.ipynb: Jupyter notebook used to insert GPL data into the MySQL database.
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