Update README

Author: hw0lff

README.md

@@ -1,3 +1,14 @@
 # Reference Documentation for Rust Analyzer Options
 
 This is a proof of concept for [rust analyzer issue #13178](https://github.com/rust-lang/rust-analyzer/issues/13178)
+
+This project can also be used to render abitrary vscode package.json files.
+This is more of a side effect than an intented use case.
+There is no guarantee it will work with your package.json as this project targets rust-analyzers package.json.
+
+Anyway have fun:
+```shell
+scripts/build.sh single <release date> <package.json> <output.html>
+# example values
+scripts/build.sh single 2024-06-09 path/to/package.json path/to/rendered/output.html
+```