Update README.md

README.md

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-A series of open datasets prepared for RAG demonstration/use cases.
+This repository is a collection of large open datasets for Retrieval-Augmented Generation.
+
+Each directory includes both a full text version and an embedding version as a zipped lancedb file.
+
+Collections currently featured or to be featured includes:
+* Greek and Latin literature translated in English, digitized by the Perseus project as 143,000 chunks.
+* Main novels digitized by the Gutenberg in multiple languages.
+* European regulations from Eurlex in multiple languages.
+* Company filings from the SEC, in English.