Update Readme.md

Readme.md

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 # Rust By Practice
 
-Practice Rust with easy to hard examples, exercises and small projects.
+This book was designed for easily diving into Rust，and it's very easy to use: All you need to do is to make each exercise comipile without ERRORS and Panics !
-
-## Read it online
-
-- [English](https://practice.rs)
-- [Chinsese](https://zh.practice.rs)
-  
-## Why another?
-
-[Rustlings](https://github.com/rust-lang/rustlings) and [Rust By Example](https://github.com/rust-lang/rust-by-example) are absolutely very nice, but we provides a little more:  
-
-1. We have more exercises of which the difficulty is from easy to hard
-
-2. Covers more topics in Rust, such as **async/await, threads, sync primitives, optimizing and stand libraries** etc
-   
-3. Learning from small projects, for pratice
-   
-4. Both English and Chinese are supported
-
-## How to use
-
-- You can edit and run the exercises online
-  
-- **The goal is to make each exercise comipile with NO ERRORS and Panics !**
-  
-- Difficulty level: easy: 🌟  medium: 🌟🌟 hard: 🌟🌟🌟  hell: 🌟🌟🌟🌟
 
   
-## Contributing
+## Features
 
-All kinds of contributions are welcomed, such as exercise proposing, typo and bug fixing.
+- There are three parts in each chapter: examples, exercises and practices
+- Covering nearly all aspects of Rust, such as **async/await, threads, sync primitives, optimizing and stand libraries** etc
+- Solutions
+- Difficulty from easy to super hard: easy 🌟  medium 🌟🌟 hard 🌟🌟🌟  super hard 🌟🌟🌟🌟
+- Both English and Chinese are supported
+
+## Indexes
 
   
-## Buy me a ... 🌟?
 
-Fo us, a github star will be better than a cup coffee, and it only costs you 0 cents :)