Add overview content to existing Introduction page

fern/products/sdks/introduction.mdx

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 ---
 title: SDKs Overview
-description: Generate idiomatic SDKs in multiple programming languages
+subtitle: Fern generates and publishes idiomatic SDKs your team can focus on building the API.
 ---
 
+## How it works
+
+At a high level, using Fern to build your SDK involves:
+
+1. **Inputting your API Definition**. Fern takes your API Definition and sets up
+   a directory (the `fern` folder) containing YAML files that describe your API endpoints,
+   request/response schemas, authentication, and error handling. 
+1. **Generating an SDK** in one or multiple languages. Fern SDKs have extensive [built-in
+   capabilities](/sdks/overview/capabilities) designed to meet your needs.
+1. **Adding your custom code and configuration**. Once you have a basic SDK
+   generated, connect to GitHub, set up publishing credentials, and and
+   configure other metadata. You can also set up [audience
+   filtering](/sdks/deep-dives/filter-your-endpoints-audiences), [auto
+   pagination](/sdks/deep-dives/configure-auto-pagination), and other advanced
+   capabilities. 
+1. **Releasing your versioned SDKs** to users via package registries. 
+
+When your API changes, simply update your definition and regenerate the SDK to release a new version. 
+
+## Get started
+
+After you've installed the Fern CLI and [set up your `fern`
+folder](/sdks/overview/quickstart), generate your SDK. Choose from a wide
+range of programming languages, each with its own idiomatic SDK generator:
+
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