Update README_en.md

README_en.md

@@ -534,6 +534,7 @@ For other pipelines in Python scripts, just adjust the `pipeline` parameter of t
   * [📊 Table Structure Recognition Module Usage Guide](./docs/module_usage/tutorials/ocr_modules/table_structure_recognition_en.md)
   * [📄 Document Image Orientation Classification Usage Guide](./docs/module_usage/tutorials/ocr_modules/doc_img_orientation_classification_en.md)
   * [🔧 Document Image Correction Module Usage Guide](./docs/module_usage/tutorials/ocr_modules/text_image_unwarping_en.md)
+  * [📐 Formula Recognition Module Usage Guide](./docs/module_usage/tutorials/ocr_modules/formula_recognition_en.md)
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 * <details>