Update README.md

README.md

@@ -53,3 +53,17 @@ The descended articles correspond to a portion of the articles that had their la
 | total words in French abstracts           | 4,437,968 |
 | total words in English captions           | 7,506,626 |
 | total words in French captions            | 8,311,727 |
+
+Field Descriptions
+------------------
+- **id:** Unique identifier for each observation.
+- **paper_id:** Unique arXiv identifier for each article.
+- **type:** 'figure' for graphic objects such as graphs, functional diagrams, etc., and 'table' for tables.
+- **authors:** Names of the article's authors.
+- **categories:** arXiv categories of the article.
+- **title:** Title of the article.
+- **summary:** Article summary.
+- **caption:** Caption of the document-type object.
+- **image:** Pillow image of the document-type object.
+- **data:** For figures, it represents the filename of the figure; for tables, it is the LaTeX transcription of the table.
+- **newcommands:** List containing the LaTeX `newcommands` used in the article.