docs(huixiangdou): add readme

docs/huixiangdou/README.md

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+<img src="https://github.com/InternLM/HuixiangDou/releases/download/v0.1.0rc1/huixiangdou.jpg" width="64" height="auto" />
+
+# [HuixiangDou](https://github.com/InternLM/HuixiangDou)
+"HuixiangDou" is a domain knowledge assistant based on LLM. Features:
+
+1. Handles complex scenarios such as group chat and handle answer user questions without flooding messages.
+2. Proposes a solution for technical issues through an algorithm pipeline.
+3. Low cost, see [arxiv2401.08772](https://arxiv.org/abs/2401.08772)
+
+# Demonstration
+HuixiangDou is a **assistant**
+* Says it doesn't know in response to halluciations
+* Personal Wechat supported
+* Feishu supported
+
+<img src="https://github.com/InternLM/HuixiangDou/releases/download/v0.1.0rc1/demo0.jpg" width="400">
+
+HuixiangDou is a **group** assistant
+* Ignores idle talk
+* Only interacts with those who need help
+
+<img src="https://github.com/InternLM/HuixiangDou/releases/download/v0.1.0rc1/inside-mmpose.jpg" width="400">
+
+HuixiangDou is a **domain knowledge** group assistant
+* Relies on an algorithm pipeline + LLM instead of training
+* Has faced thousands of users, and has been "teased" over 20,000 times in half a year
+
+<img src="https://github.com/InternLM/HuixiangDou/releases/download/v0.1.0rc1/inside-middleware.png" width="400">
+
+# Configuring deepseek API
+**STEP1.** Apply for a token at deepseek open platform
+
+**STEP2.** Follow the HuixiangDou Advanced Configuration and fill in the config.ini with your token
+
+```ini
+# config.ini
+[llm]
+enable_local = 0
+enable_remote = 1
+..
+[llm.server]
+..
+remote_type = "deepseek"
+remote_api_key = "YOUR-API-KEY"
+remote_llm_max_text_length = 16000
+remote_llm_model = "deepseek-chat"
+```
+
+**STEP3.** Run
+
+```shell
+python3 -m huixiangdou.main --standalone
+```