docs(data/README.md): rephrased documentation for data directory

data/README.md

@@ -4,8 +4,12 @@ This directory contains pre-collected data used for testing and development purp
 
 ## Structure
 
-- `raw/`: Contains raw data files as collected from the source.
-- `processed/`: Contains processed data files that have been cleaned or transformed for use in the project.
+- `raw/`: Contains raw data files as collected from the source. There are two folders here
+    - `metafile/`: The schema for this `csv` file collection is filepath, start_date, end_date. Where the filepath
+    is the location of the logs for the failed tasks. start_date and end_date are also the metainformation of the failed tasks.
+    - `logfile/`: The actual log files contents. As airflow stores logs in configured file location, we've collect log from those files.
+- `processed/`: Contains processed data files that have been cleaned or transformed for use in the project. Here resides the files after bieng
+    extracted and transformed for categorization.
 
 ## Usage