add highlights

Author: hctian713

.DS_Store

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+## 🔥 Highlights
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+- 🏗️ A scalable simulation pipepline that synthesizes diverse and high-fidelity reactive driving scenarios with pseudo-expert. 
+- 🚀 An effective sim-real co-training strategy that improves robustness and generalization across end-to-end planners. 
+- 🔬 A comprehensive recipe that reveals crucial insights into the underlying scaling properties of sim-real learning systems.
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 ## 📢 News
 
 - **[2025/12/1]** We released our [paper](https://arxiv.org/abs/2511.23369) on arXiv.