update readme.md

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sunface
2022-02-24 15:58:35 +08:00
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@ -10,6 +10,7 @@ Greetings and welcome to `exercise.rs` If you have the following problems:
Then you have come to a right place: here you can find a bunch of easy to hard exercises to improve your Rust skillsthis will help you fill the gap of easy-to-learn and hard-to-use.
## About exercises
- The only correct way: make exercise comipile with NO ERRORS!
- difficulty level: easy: 🌟 medium: 🌟🌟 hard: 🌟🌟🌟 hell: 🌟🌟🌟🌟
- Everything is online: reading, editing, testing