readded hugo-book theme files.

themes/hugo-book/exampleSite/content.en/docs/shortcodes/columns.md

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+# Columns
+
+Columns help organize shorter pieces of content horizontally for readability. `columns` shortcode styles markdown list as up to 3 columns.
+
+## Example
+
+```tpl
+{{%/* columns [ratio="1:1"] [class="..."] */%}}
+- ### Left Content
+  Lorem markdownum insigne...
+
+- ### Mid Content
+  Lorem markdownum insigne...
+
+- ### Right Content
+  Lorem markdownum insigne...
+{{%/* /columns */%}}
+```
+
+{{% columns %}}
+- ### Left Content
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
+  protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
+  Miseratus fonte Ditis conubia.
+
+- ### Mid Content
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter!
+
+- ### Right Content
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
+  protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
+  Miseratus fonte Ditis conubia.
+{{% /columns %}}
+
+## Settings size ratio for columns
+
+```tpl
+{{%/* columns ratio="1:2" */%}}
+- ## x1 Column
+  Lorem markdownum insigne...
+
+- ## x2 Column
+  Lorem markdownum insigne...
+{{%/* /columns */%}}
+```
+
+{{% columns ratio="1:2" %}}
+- ### x1 Column
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
+  protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
+  Miseratus fonte Ditis conubia.
+
+- ### x2 Column
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter!
+  
+  Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
+  stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
+  protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
+  Miseratus fonte Ditis conubia.
+{{% /columns %}}