Clarify usage of boolean Options

The Quick start sample in Readme.md gives the impression that boolean parameter can be specified with either a true or false value. However my attemps have given the following:

- whenever the parameter exists on the commandline the value will always be true
- omitting the parameter will set it to tits default value.
- trying to specify either True or False as value is ignored.
- having default value of true will always have the Option value set to true

Is this how it is supposed to work?

从 Readme.md 中的 Quick start 示例开始，将其布尔选项语法与 issue 中描述的行为进行比较。检查相关的命令行选项文档或示例，以确定受支持的形式和默认值。当示例及其附带说明不再暗示支持处理不受支持的 true/false 值时，即完成。

由索引模型根据 Issue 内容生成。