feat: config readme

Author: Szymon Szyszkowski

config/README.md

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+# Config description
+
+This is the config documentation for the airflow dag configs.
+
+- [x] filter.csv - file representing 500 GWAS Catalog studies for testing purposes
+- [x] ot_config.yaml - configuration for existing open targets genetics dags
+- [x] datasets/ and step/ - detailed configuration of the genetics dags including step configuration and Google Cloud paths configuration
+- [x] config.yaml - configuration for the GWAS Catalog DAG (in progress) TODO: change the name to match the dag name.
+
+The overall idea is to merge existing configurations into single-file configurations that will be dynamically fetched from the `root/config/` directory given the dag name. (IN progress)