Add doc updates (microsoft#2658)

docs/updates/v3.0.md

@@ -5,7 +5,30 @@ version: 3.0
 
 # nnn nnn (v3.0)
 
-For a detailed change log see [v3](../CHANGELOG-v3.md).
+Welcome to the nnn nnn release of PSRule.
+There are many updates in this version that we hope you'll like, some of the key highlights include:
+
+- [Official CLI support](#official-cli-support) — A new CLI experience for PSRule.
+- [Module lock file](#module-lock-file) — Manage the versions of modules used by PSRule.
+- [Runtime integration](#runtime-integration) — More seamless integration with Visual Studio Code.
+
+See the detailed change log [here](../CHANGELOG-v3.md).
+
+## Official CLI support
+
+While many of you have been using PSRule through PowerShell for some time,
+we've been working on a new experience for those who prefer a CLI.
+
+Additionally we wanted to improve the bootstrapping experience for PSRule in CI/CD pipelines.
+
+The new CLI runs on Windows, macOS, and Linux and is available as a standalone executable or can be installed as a .NET tool.
+
+## Module lock file
+
+We've introduced a new feature to help you manage the versions of modules used by PSRule.
+The module lock file is a JSON-based file named `ps-rule.lock.json` that lists the modules and versions used by PSRule.
+
+This makes it easier to share and reproduce the versions of modules used during development and CI/CD pipelines.
 
 ## Visual Studio Code
 
@@ -29,6 +52,12 @@ a prerequisite step was to install PowerShell on non-Windows OSs and then instal
 
 We've done away with this approach entirely for the authoring experience in VSCode by providing native support in the extension.
 
+This means you can now use PSRule in VSCode without needing to install PowerShell or PSRule on your machine.
+We've improved the experience by adding the ability to:
+
+- Restore modules from the VSCode command palette.
+- Asking to automatically restore required modules when you open a workspace that contains a PSRule lock file.
+
 ### Other minor features and improvements
 
 - You can now override the options file that VSCode uses when running PSRule.