Documentation
Documentation is a very crucial aspect of any open source software aiming for wide adoption by the programmer community. While your code, which should be readable, tells you how it works, the documentation should tell you about the why and how of the design decisions and example usage of the public APIs of your software. Well documented code with a comprehensive README.md page boosts the discoverability of your project many times over.
The Rust community takes documentation very seriously and has tools at various levels to make it easy to write documentation for code. It also makes it presentable and consumable for its users. For writing documentation, it supports the markdown dialect. Markdown is a very popular markup language and is the standard these days for writing docs. Rust has a dedicated tool called rustdoc that parses markdown doc comments, converts them to HTML, and generates beautiful and searchable documentation pages.
Writing documentation
To write documentation...
