Automated documentation update [skip ci] (#26)

Co-authored-by: github-actions <github-actions@github.com>

Author: markphip

src/artifacts-helper/README.md

@@ -19,11 +19,27 @@ Configures Codespace to authenticate with Azure Artifact feeds
 | dotnet6 | Use .NET 6 Runtime | boolean | false |
 | dotnetAlias | Create alias for dotnet | boolean | true |
 | nugetAlias | Create alias for nuget | boolean | true |
+| npmAlias | Create alias for npm | boolean | true |
+| yarnAlias | Create alias for yarn | boolean | true |
 
 This installs [Azure Artifacts Credential Provider](https://github.com/microsoft/artifacts-credprovider)
-and optionally configures an alias for `dotnet` and `nuget` that dynamically sets an authentication token
+and optionally configures an alias for `dotnet`, `nuget`, `npm`, and `yarn` that dynamically sets an authentication token
 for pulling artifacts from a feed before running the command.
 
+For `npm` and `yarn` this requires that your `~/.npmrc` file is configured to use the ${ARTIFACTS_ACCESSTOKEN}
+environment variable for the password. A helper script has been added that you can use to write your `~/.npmrc`
+file during your setup process, though there are many ways you could accomplish this. To use the script, run it like
+this:
+
+```
+write-npm.sh pkgs.dev.azure.com/orgname/projectname/_packaging/feed1/npm
+write-npm.sh pkgs.dev.azure.com/orgname/projectname/_packaging/feed2/npm username
+write-npm.sh pkgs.dev.azure.com/orgname/projectname/_packaging/feed3/npm username email
+```
+
+You must pass the feed name to the script, but you can optionally provide a username and email if desired. Defaults
+are put in place if they are not provided.
+
 ## OS Support
 
 This feature is tested to work on Debian/Ubuntu and Mariner CBL 2.0