Update top level readme

Author: jackzhxng

README.md

@@ -51,7 +51,7 @@ To get started you can:
 
 - Visit the [Step by Step Tutorial](https://pytorch.org/executorch/main/index) to get things running locally and deploy a model to a device
 - Use this [Colab Notebook](https://pytorch.org/executorch/main/getting-started-setup#quick-setup-colab-jupyter-notebook-prototype) to start playing around right away
-- Jump straight into LLM use cases by following specific instructions for [Llama](examples/models/llama/README.md) and [Llava](examples/models/llava/README.md)
+- Jump straight into LLM use cases by following specific instructions for popular open-source models such as [Llama](examples/models/llama/README.md), [Qwen 3](examples/models/qwen3/README.md), [Phi-4-mini](examples/models/phi_4_mini/README.md), and [Llava](examples/models/llava/README.md)
 
 ## Feedback and Engagement