Create mlapo README.md

[randgun]

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Summary of Changes

Hello @randgun, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求引入了一个新的 README.md 文件，旨在为MLA场景下的PagedAttention输入数据预处理模块提供全面的文档。该文档详细阐述了模块的功能、关键参数（如缓存和量化模式）、输入输出张量规范以及操作约束，从而帮助开发者更好地理解和使用该模块，提升代码的可维护性和可读性。

Highlights

• 新增文档: 新增了 csrc/mla_preprocess/README.md 文件，详细描述了MLA场景下PagedAttention输入数据处理的功能和使用方法。
• 参数定义: 文档定义了 MlaPreprocessParam 结构体，其中包含了如维度、旋转系数、转置标志、缓存模式（CacheMode）和量化模式（QuantMode）等关键参数。
• 模式详解: 详细说明了 cacheMode 和 quantMode 的不同选项及其对数据处理流程和输出格式的影响，包括未实现的量化类型。
• 输入输出规范: 列出了MLA预处理模块的详细输入和输出Tensor，包括其标识、名称、数据类型、格式、维度约束和详细描述。

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