Need explanation regarding how to build after cloning

Building program_options as part of a boost distribution is easy. But if I clone this repository and want to build the latest version - how do I do that?

Either a README.md should explain this, or if you don't want to "pollute" the hierarchy with that file - at least a Wiki page here on GitHub, or a title link to somewhere explaining how to do it.

首先检查仓库的 README.md 和 Boost 发行版的构建指南，以确定克隆后的受支持流程。在 README.md 中记录这些步骤，或链接到一个持续维护的 Wiki 页面，并提供足够的详细信息，使用户能够独立构建最新的 program_options 版本。

由索引模型根据 Issue 内容生成。