V119-052: Mention custom_env Code Sample in README

Author: AnthonyLeonardoGracio

integration/vscode/Code Samples/README.md

@@ -6,3 +6,4 @@ Here is some code samples for the Ada Language Server and the VS Code extension.
 * [Docker](docker/) - example using Ada with Remote/Container VS Code feature
 * [Gnatprove](gnatprove/) - SPARK/gnatprove integration example
 * [Refactoring demos](refactoring_demos/) - sample code to check refactoring capabilities
+* [Custom worspace-specific environment](custom_env/) - example showing how to set workspace-specific environment variables