新增 gitbook目录

.gitignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# Deployed apps should consider commenting this line out:
+# see https://npmjs.org/doc/faq.html#Should-I-check-my-node_modules-folder-into-git
+node_modules
+
+_book/
+book.pdf
+book.epub
+book.mobi

SUMMARY.md

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+# 目录
+
+* [简介](README.md)
+* 第1章 [绪论](chapter1.md)
+* 第2章 [模型评估与选择](chapter2.md)
+* 第3章 [线性模型](chapter3.md)
+

book.json

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+{
+    "plugins": ["katex"],
+    "pdf": {
+        "fontFamily": "SimHei"
+    }
+}