[Added] Book configuration

Author: simonsan

SUMMARY.md

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+# Summary
+
+- [Introduction](./intro.md)
+- [Idioms](./idioms/README.md)
+	* [Concatenating Strings with `format!`](./idioms/concat-format.md)
+	* [Constructor](./idioms/ctor.md)
+	* [The `Default` Trait](./idioms/default.md)
+	* [Collections Are Smart Pointers](./idioms/deref.md)
+	* [Finalisation in Destructors](./idioms/dtor-finally.md)
+	* [`mem::replace(_)`](./idioms/mem-replace.md)
+	* [On-Stack Dynamic Dispatch](./idioms/on-stack-dyn-dispatch.md)
+	* [Iterating over an `Option`](./idioms/option-iter.md)
+	* [Pass Variables to Closure](./idioms/pass-var-to-closure.md)
+	* [Privacy For Extensibility](./idioms/priv-extend.md)
+	* [Easy doc initialization](./idioms/rustdoc-init.md)
+	* [Temporary mutability](./idioms/temporary-mutability.md)
+	
+- [Design Patterns](./patterns/README.md)
+	* [Builder](./patterns/builder.md)
+	* [Compose Structs](./patterns/compose-structs.md)
+	* [Entry API](./patterns/entry.md)
+	* [Fold](./patterns/fold.md)
+	* [Late Bound Bounds](./patterns/late-bounds.md)
+	* [Newtype](./patterns/newtype.md)
+	* [RAII Guards](./patterns/RAII.md)
+	* [Prefer Small Crates](./patterns/small-crates.md)
+	* [Contain unsafety in small modules](./patterns/unsafe-mods.md)
+	* [Visitor](./patterns/visitor.md)
+
+- [Anti-patterns](./anti_patterns/README.md)
+	* [`#[deny(warnings)]`](./anti_patterns/deny-warnings.md)
+	* [Deref Polymorphism](./anti_patterns/deref.md)

anti_patterns/README.md

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+# Anti-patterns

book.toml

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+[book]
+authors = ["the rust-unofficial authors"]
+language = "en"
+multilingual = false
+src = "."
+title = "Rust patterns"
+
+[output.html]
+
+[output.linkcheck]  # enable the "mdbook-linkcheck" renderer

idioms/README.md

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+# Idioms

patterns/README.md

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+# Design Patterns