Clarify README for R implementation and legacy use

README.md

@@ -1,7 +1,12 @@
-# Immunization Charts
+# Immunization Charts (R Version)
 
 ## Introduction
-This project provides an approach to the creation of custom immunization history charts. These charts can be generated as part of notice letters for overdue Immunization of School Pupils Act (ISPA)-mandated or Child Care and Early Years Act (CCEYA)-mandated immunizations.
+
+This repository contains the **R implementation** of the immunization charts project.
+
+It provides an approach for generating custom immunization history charts, which can be incorporated into notice letters for overdue **Immunization of School Pupils Act (ISPA)**-mandated or **Child Care and Early Years Act (CCEYA)**-mandated immunizations.
+
+⚠️ **Note:** A newer version of this project is now available. This R version remains accessible for reference and legacy use, but users are encouraged to explore the updated release for the latest features and improvements.
 
 ## Usage
 ### Environment
@@ -39,4 +44,4 @@ Note that immunization history for a single client can exceed a single page. For
 `test.R` generates a data file with vaccination history for a single client, which can be used with `make_charts.R` with default parameters. This client receives every vaccine in `vaccine_reference.xlsx` (one per week). Running `test.R` will create `input` and `output` subdirectories, create the test data, and generate a PDF notice for the client.
 
 ## Contributing
-Fixes or additions to the `vaccine_reference.xlsx`, dependency updates, documentation improvements, and additions of tests will enhance the usability and reliability of this project and are welcome contributions.
+Fixes or additions to the `vaccine_reference.xlsx`, dependency updates, documentation improvements, and additions of tests will enhance the usability and reliability of this project and are welcome contributions.