docs: note that photographed text is not supported

Added note: This module extracts text entries from PDF files. It does not support photographed text. If you cannot select text from the PDF file, **you may need to use OCR software first**. Cf #104.
adrienjoly · Apr 2, 2022 · a8b4764 · a8b4764
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diff --git a/README.md b/README.md
@@ -6,7 +6,9 @@ Supports **tabular data** with automatic column detection, and **rule-based pars
 
 Dependencies: it is based on [pdf2json](https://www.npmjs.com/package/pdf2json), which itself relies on Mozilla's [pdf.js](https://github.com/mozilla/pdf.js/).
 
-ℹ️ This module is meant to be run using Node.js only. **It does not work from a web browser.**
+ℹ️ Important notes:
+- This module is meant to be run using Node.js only. **It does not work from a web browser.**
+- This module extracts text entries from PDF files. It does not support photographed text. If you cannot select text from the PDF file, **you may need to use OCR software first**.
 
 Summary: