show_code/icon library

1. ume_kit_show_code package
2. documentation
3. show_code/icon.dart

ume_kit_show_code package

1. Libraries
2. show_code/code_display_service
3. show_code/icon
4. show_code/page_info_helper
5. show_code/show_code
6. show_code/syntax_highlighter
7. ume_kit_show_code