docs(readme): add Write Documentation section

README.md

@@ -25,7 +25,7 @@ git clone [email protected]:sebkolind/ts-lib-starter.git my-project
 cd my-project
 ```
 
-### Configure package
+### Configure Package
 
 Open the `package.json` file and change the `name`, `description` and `author` fields to something you'd like.
 The `name` should be unique and you should use a namespace (like how I use `@sebkolind` for my packages),
@@ -51,3 +51,11 @@ docs:dev # development
 docs:build # build for release
 docs:preview # preview release
 ```
+
+## Write Documentation
+
+I use [VitePress](https://vitepress.dev/) to write documentation for my packages. It's easy to use, comes
+with a great default theme, and you write your content in Markdown.
+
+VitePress is already installed, so to get started you can use the documentation found [here](https://vitepress.dev/guide).
+I use the default configuration, so it should be easy to follow the guide from start to finish.