docs(exercises): updated all exercises readme files

all exercises readme files now have a unified structure and a description
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Zerotask
2021-04-23 19:54:31 +02:00
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20 changed files with 85 additions and 54 deletions

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### If
# If
`if`, the most basic type of control flow, is what you'll learn here.
#### Book Sections
## Further information
- [Control Flow - if expressions](https://doc.rust-lang.org/book/ch03-05-control-flow.html#if-expressions)