mmd pmd格式解析

https://blog.goo.ne.jp/torisu_tetosuki/e/209ad341d3ece2b1b4df24abf619d6e4

The issue links to an external blog post in Japanese about MMD PMD format parsing. First, understand the project's purpose and existing codebase for Miku Miku Dance. Look for any existing parsers or file handling code. Determine what specific parsing functionality or documentation is needed from the linked resource. 'Done' would be integrating or documenting the PMD format based on that external reference.

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