Update README.md to clarify that vscode-codeql also installs 'Test Adapter Converter' and 'Test Explorer UI' (#1831)

Co-authored-by: Andrew Eisenberg <aeisenberg@github.com>

README.md

@@ -20,6 +20,13 @@ To see what has changed in the last few versions of the extension, see the [Chan
 
 This project will track new feature development in CodeQL and, whenever appropriate, bring that functionality to the Visual Studio Code experience.
 
+## Dependencies
+
+This extension depends on the following two extensions for required functionality. They will be installed automatically when you install VS Code CodeQL.
+
+- [Test Adapter Converter](https://marketplace.visualstudio.com/items?itemName=ms-vscode.test-adapter-converter)
+- [Test Explorer UI](https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-test-explorer)
+
 ## Contributing
 
 This project welcomes contributions. See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to build, install, and contribute.

extensions/ql-vscode/README.md

@@ -16,7 +16,9 @@ For information about other configurations, see the separate [CodeQL help](https
 
 ### Quick start: Installing and configuring the extension
 
-1. [Install the extension](#installing-the-extension).
+1. [Install the extension](#installing-the-extension).  
+   *Note: vscode-codeql installs the following dependencies for required functionality: [Test Adapter Converter](https://marketplace.visualstudio.com/items?itemName=ms-vscode.test-adapter-converter), [Test Explorer UI](https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-test-explorer).*
+
 1. [Check access to the CodeQL CLI](#checking-access-to-the-codeql-cli).
 1. [Clone the CodeQL starter workspace](#cloning-the-codeql-starter-workspace).