Update README.md

README.md

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 [![Coverage](https://codecov.io/gh/TulipaEnergy/TulipaIO.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/TulipaEnergy/TulipaIO.jl)
 [![DOI](https://zenodo.org/badge/DOI/FIXME)](https://doi.org/FIXME)
 
+## About `TulipaIO.jl` (`TIO`)
+
+This package relies on [`DuckDB`](https://duckdb.org/docs/) to tie a
+variety of data sources with Julia, and `TulipaEnergyModel` (`TEM`).
+It also enables a bidirectional capability to manipulate datasets from
+Julia and back to DuckDB.
+
+A standard workflow requires a DuckDB connection, either to an
+in-memory database, or to a database file.  Every data source is can
+be made available in the database as a table, optionally importing it.
+We can use SQL queries to transform and manipulate these tables into
+something `TEM` can consume.  Thankfully we don't need to resort to
+SQL every time.  `TIO` offers Julia functions that wrap common
+transformations into a consistent API.  These functions can be chained
+together to form a data processing pipeline.
+
+The package also offers parsers for data formats like ESDL.
+
 ## How to Cite
 
 If you use TulipaIO.jl in your work, please cite using the reference given in [CITATION.cff](https://github.com/TulipaEnergy/TulipaIO.jl/blob/main/CITATION.cff).