update readme

Author: Elizabeth

README.md

@@ -12,6 +12,8 @@ For more on how the dataflow queries work, visit [dataflow docs](./codeql-custom
 
 ## Requirements
 
+Install Visual Studio Code, download [here](https://code.visualstudio.com/download)
+
 To run these queries, set up the [VS Code extension for CodeQL](https://codeql.github.com/docs/codeql-for-visual-studio-code/setting-up-codeql-in-visual-studio-code/).  
 If the CLI interface is preferred, install [CodeQL](https://codeql.github.com/) and set up the [CodeQL CLI](https://docs.github.com/en/code-security/codeql-cli/getting-started-with-the-codeql-cli/setting-up-the-codeql-cli).
 
@@ -29,13 +31,13 @@ If you wish to run it on other extensions, download the source code and build th
 
 ### Running Queries With the VS Code CodeQL extension  
 
-0. Open this repo in VS Code.
+0. Open this repo in VS Code, this will ensure all required libraries of CodeQL are accessible for the queries to execute successfully.
 
 1. Load database  
-Select `From a folder` and choose from the databases provided in [sample-data](./sample-data) 
+Select `From a folder` and choose from the databases provided in [sample-data](./sample-data)  
 ![load-database](./images/load-database.png)
 
-2. Select database (the checkmark indicates database is selected)  
+2. Select database (the checkmark indicates database is selected)   
 ![select-database](./images/select-database.png)
 
 3. In VS Code, right-click on query file or open a query file and right-click.