Initialize the book source

.gitignore

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+book

README.md

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-# conlang
+# Conlangs
 
-Repository for my constructed languages.
+Repository for documenting my constructed languages.
+
+<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">
+  <img
+    alt="Creative Commons License"
+    src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" />
+</a>
+
+These documentations are licensed under a
+[Creative Commons Attribution-ShareAlike 4.0 International License][CC-BY-SA].
+
+[CC-BY-SA]: https://creativecommons.org/licenses/by-sa/2.0/

book.toml

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+[book]
+authors = ["Ngô Ngọc Đức Huy"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Huy's conlangs"

src/SUMMARY.md

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

src/chapter_1.md

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+# Chapter 1