release initial code

Co-authored-by: Ying Sheng <sqy1415@gmail.com>
Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>
Co-authored-by: Zhiqiang Xie <xiezhq@stanford.edu>
Co-authored-by: parasol-aser <3848358+parasol-aser@users.noreply.github.com>
Co-authored-by: LiviaSun <33578456+ChuyueSun@users.noreply.github.com>
Co-authored-by: Cody Yu <hao.yu.cody@gmail.com>

docs/flashinfer.md

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+## Flashinfer Mode
+
+[`flashinfer`](https://github.com/flashinfer-ai/flashinfer) is a kernel library for LLM serving; we use it here to support our attention computation.
+
+### Install flashinfer
+
+```bash
+git submodule update --init --recursive
+pip install 3rdparty/flashinfer/python
+```
+
+### Run Sever With Flashinfer Mode
+
+Add through `--model_mode` argument from the command line.
+
+Example:
+
+```bash
+python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000 --model-mode flashinfer
+```