Added notes RE: local install

Author: nuxy

BuildDependencies.md

@@ -1,4 +1,6 @@
 # Build dependencies
 
+If you're not using the [L³ VS Code extension](https://marketplace.visualstudio.com/items?itemName=Nuxy.vscode-lambda-lambda-lambda) and want to _run this package locally_ you must install the following dependencies:
+
 - [AWS SAM CLI](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html)
 - [Node.js](https://nodejs.org)