docs: link README(s) to Vitamin C notes

Surface #1962 from module and repository entrypoints.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Chessing234

README.md

@@ -114,3 +114,7 @@ By committing your code to the [MIMIC Code Repository](https://github.com/mit-lc
 ### Coding style
 
 Please refer to the [style guide](https://github.com/MIT-LCP/mimic-code/blob/main/styleguide.md) for guidelines on formatting your code for the repository.
+
+### MIMIC-IV notes
+
+- [Vitamin C / ascorbic acid](mimic-iv/docs/VITAMIN_C.md)

mimic-iv/README.md

@@ -105,4 +105,8 @@ mimic_utils convert_folder mimic-iv/concepts mimic-iv/concepts_duckdb --destinat
 
 # To PostgreSQL:
 mimic_utils convert_folder mimic-iv/concepts mimic-iv/concepts_postgres --destination_dialect postgres
-```
+```
+
+## Vitamin C / ascorbic acid
+
+No dedicated table — see [docs/VITAMIN_C.md](docs/VITAMIN_C.md).