Add language switching (intel-analytics#12096)

README.md

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-# 💫 Intel® LLM Library for PyTorch*
+#  💫 Intel® LLM Library for PyTorch* 
+<p>
+  <b>< English</b> | <a href='./README.zh-CN.md'>中文</a> >
+</p>
+
 **`IPEX-LLM`** is a PyTorch library for running **LLM** on Intel CPU and GPU *(e.g., local PC with iGPU, discrete GPU such as Arc, Flex and Max)* with very low latency[^1]. 
 > [!NOTE]
 > - *It is built on top of the excellent work of **`llama.cpp`**, **`transformers`**, **`bitsandbytes`**, **`vLLM`**, **`qlora`**, **`AutoGPTQ`**, **`AutoAWQ`**, etc.*