cargo doc

Documentation comments use three slashes, ///.We place documentation comments just before the item we want to document.
Crate Comments //! describes the purpose of my_crate

//! # My Crate
//!
//! `my_crate` is a collection of utilities to make performing certain calculations more convenient.

pub struct test {   //Adding description to struct fields
    /// a text
    a: String,
    /// b text
    b: String,
}

struct Solution{}

impl Solution {
/// add()
/// # Examples
/// ```
/// let a = 5, b=4;
/// let answer = Solution::add(a, b);
///
/// assert_eq!(9, answer);
/// ```
    fn add(a:i32, b:i32)-<i32{
        a + b
    }
}

fn main() {
    println!("Hi");
}

$ cargo doc
    Documentation in target\doc
$ cargo doc --open                //Will open Front page of create root  
$ cargo test add()                //This will run test case in documentation