chore: add readme

.aichat.example.toml

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+api_key = "<YOUR SECRET API KEY>"        # Request via https://platform.openai.com/account/api-keys
+temperature = 1.0                        # optional, see https://platform.openai.com/docs/api-reference/chat/create#chat/create-temperature
+proxy = "socks5://127.0.0.1:1080"        # optional, set proxy server. e.g. http://127.0.0.1:8080 or socks5://127.0.0.1:1080
+
+[[roles]]                                
+name = "javascript-console"
+prompt = "I want you to act as a javascript console. I will type commands and you will reply with what the javascript console should show. I want you to only reply with the terminal output inside one unique code block, and nothing else. do not write explanations. do not type commands unless I instruct you to do so. when i need to tell you something in english, i will do so by putting text inside curly brackets {like this}. First sentense will append to prompt:"

README.md

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+# AIChat
+
+Chat with OpenAI GPT-3.5 in the terminal.
+
+## Install
+
+### With cargo
+
+```
+cargo install --force aichat
+```
+
+### Binaries on macOS, Linux, Windows
+
+Download from [Github Releases](https://github.com/sigoden/aichat/releases), unzip and add opscan to your $PATH.
+
+## Config
+
+When starting for the first time, aichat will prompt to set `api_key`, after setting, it will automatically create the configuration file at `$HOME/.aichat.toml`. Of course, you can also manually set the configuration file. 
+
+```toml
+api_key = "<YOUR SECRET API KEY>"        # Request via https://platform.openai.com/account/api-keys
+temperature = 1.0                        # optional, see https://platform.openai.com/docs/api-reference/chat/create#chat/create-temperature
+proxy = "socks5://127.0.0.1:1080"        # optional, set proxy server. e.g. http://127.0.0.1:8080 or socks5://127.0.0.1:1080
+```
+
+> We provide a [sample configuration file](.aichat.example.toml). 
+
+## Roles
+
+We can let ChatGPT play a certain role through `prompt` to make it better generate what we want. See [awesome-chatgpt-prompts](https://github.com/f/awesome-chatgpt-prompts) for details.
+
+In aichat, we can predefine a batch of roles in the configuration. For example, we define a javascript-console role as follows.
+
+```toml
+[[roles]]
+name = "javascript-console"
+prompt = "I want you to act as a javascript console. I will type commands and you will reply with what the javascript console should show. I want you to only reply with the terminal output inside one unique code block, and nothing else. do not write explanations. do not type commands unless I instruct you to do so. when i need to tell you something in english, i will do so by putting text inside curly brackets {like this}. My first command is:"
+```
+
+Let ChaGPT answer questions in the role of a javascript-console.
+
+```
+aichat --role javascript-console console.log("Hello World")
+```
+
+In interactive mode, we do this:
+
+```
+〉.role javascript-console
+〉console.log("Hello world")
+```
+
+## License
+
+Copyright (c) 2023 aichat-developers.
+
+aichat is made available under the terms of either the MIT License or the Apache License 2.0, at your option.
+
+See the LICENSE-APACHE and LICENSE-MIT files for license details.