add_theme: Add theme to code hierarchy
Description
Adds a new theme to the code hierarchy tree. Themes can be used to organize and
group related codes in a hierarchical structure.
Usage
add_theme(node, theme_name, description = "")
Value
Updated node with new theme added
Arguments
- node
Root node of the hierarchy tree
- theme_name
Character string specifying the name of the new theme
- description
Optional character string providing a description of the theme