Add an article on Docstring

src/blog/post-3.md

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+---
+title: 'Why I Write Docstrings'
+pubDate: 2025-05-16
+author: 'Nakahara Daisuke'
+tags: ["programming"]
+---
+
+I try to write docstrings as much as possible for two main reasons. 
+First, they help reviewers understand the roles of functions and classes. 
+Second, I believe that clear, detailed docstrings can enable AI tools to generate code more effectively.
+
+Although I sometimes make mistakes in my docstrings, 
+I think that even imperfect documentation is better than none. 
+Moreover, both reviewers and AI tools can help identify and correct these errors.