docs: init cli docs

docs/cli/.gitignore

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+book

docs/cli/book.toml

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+[book]
+authors = ["YuKun Liu"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Dioxus Cli"

docs/cli/src/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)

docs/cli/src/chapter_1.md

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+# Chapter 1