Add mdbook project for Japanese translation

Closes #543

Makefile

@@ -37,6 +37,7 @@ docs:
 	mkdir -p docs out/api out/guide/en
 	$(POETRY) run pdoc -e serde=https://github.com/yukinarit/pyserde/tree/main/serde/ serde -o out/api
 	mdbook build -d ../../out/guide/en ./docs/en
+	mdbook build -d ../../out/guide/ja ./docs/ja
 
 open-docs:
 	$(POETRY) run pdoc -e serde=https://github.com/yukinarit/pyserde/tree/main/serde serde

docs/en/book.toml

@@ -7,4 +7,4 @@ title = "pyserde documentation"
 
 [output.html]
 git-repository-url = "https://github.com/yukinarit/pyserde"
-edit-url-template = "https://github.com/yukinarit/pyserde/edit/main/{path}"
+edit-url-template = "https://github.com/yukinarit/pyserde/edit/main/en/{path}"

docs/ja/SUMMARY.md

@@ -0,0 +1,13 @@
+# Summary
+
+- [Introduction](introduction.md)
+- [Getting Started](getting-started.md)
+- [Data Formats](data-formats.md)
+- [Types](types.md)
+- [Decorators](decorators.md)
+- [Class Attributes](class-attributes.md)
+- [Field Attributes](field-attributes.md)
+- [Union](union.md)
+- [Type Checking](type-check.md)
+- [Extension](extension.md)
+- [FAQ](faq.md)

docs/ja/book.toml

@@ -0,0 +1,10 @@
+[book]
+authors = ["yukinarit"]
+language = "ja"
+multilingual = true
+src = "./"
+title = "pyserde documentation"
+
+[output.html]
+git-repository-url = "https://github.com/yukinarit/pyserde"
+edit-url-template = "https://github.com/yukinarit/pyserde/edit/main/ja/{path}"

docs/ja/introduction.md

@@ -0,0 +1,27 @@
+# Introduction
+
+`pyserde`は[dataclasses](https://docs.python.org/3/library/dataclasses.html)ベースのシンプルで強力なシリアライゼーションライブラリです。
+
+クラスに`@serde`デコレータを付けるだけで、クラスを様々なデータフォーマットに変換可能になります。
+
+```python
+@serde
+class Foo:
+    i: int
+    s: str
+    f: float
+    b: bool
+```
+
+`Foo`クラスは以下のようにJSONにシリアライズ出来るようになります。
+
+```python
+>>> to_json(Foo(i=10, s='foo', f=100.0, b=True))
+'{"i":10,"s":"foo","f":100.0,"b":true}'
+```
+
+また、JSONから`Foo`クラスにデシリアライズも出来るようになります。
+```python
+>>> from_json(Foo, '{"i": 10, "s": "foo", "f": 100.0, "b": true}')
+Foo(i=10, s='foo', f=100.0, b=True)
+```