doc: readme: add quickstart installation instructions

Add a one-line curl command to install the SOF development environment using
sdk-install.sh. This makes it easier for new users to bootstrap their
environment interactively.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

README.md

@@ -14,6 +14,17 @@ Additional community support is available via the `#sof` channel in the Zephyr P
 
 See [docs](https://thesofproject.github.io/latest/index.html)
 
+## Quickstart
+
+You can easily set up the complete SOF development environment, including Zephyr SDK and QEMU, by running our interactive installer script. To run the installer locally:
+
+```bash
+curl -fsSLo sdk-install.sh https://raw.githubusercontent.com/thesofproject/vscode-workspace/main/sdk-install.sh
+bash sdk-install.sh
+```
+
+The script will guide you through the process of installing system dependencies, cloning the repositories, configuring Python virtual environments, and setting up the Zephyr SDK and QEMU.
+
 ## Running the tests
 
 See [unit testing documentation](https://thesofproject.github.io/latest/developer_guides/unit_tests.html)