Add README for v3.0.9.

README.md

@@ -1 +1,23 @@
-# wiseconnect
+# WiSeConnect™ 3 SDK
+
+The Silicon Labs WiSeConnect™ software development kit (SDK) offers an application programming interface for use with the SiWx91x™ chipset family for Wi-Fi and Bluetooth Low Energy (BLE) connectivity.
+
+The WiSeConnect 3 (versions 3.0.0 and later) SDK is the next-generation API for Silicon Labs customers that replaces WiSeConnect 2 (versions earlier than 3.0.0) with modular design and organization of features into configurable components.
+
+## Release Notes
+
+See [here](docs/release-notes/index.md) for the latest release notes.
+
+## Documentation
+
+The Silicon Labs [documentation site](https://docs.silabs.com/wiseconnect/3.0.9) hosts the latest documentation for the WiSeConnect 3 SDK, including:
+  - [Getting started](https://docs.silabs.com/wiseconnect/3.0.9/wiseconnect-getting-started/getting-started-with-soc-mode) with the SDK.
+  - A [migration guide](https://docs.silabs.com/wiseconnect/3.0.9/wiseconnect-developers-guide-migr-overview/) for porting WiSeConnect 2 applications to WiSeConnect 3.
+  - A list of the [examples](https://docs.silabs.com/wiseconnect/3.0.9/wiseconnect-examples/) available with WiSeConnect 3.
+
+An API Reference Guide is also available. To use this guide:
+  - Clone this repo to your local folders.
+    ```
+	git clone https://github.com/siliconlabs/wiseconnect
+	```
+  - Open the following file path within the cloned repo on your browser: `docs/index.html`