Updating CDL documentation for including semantic annotations

[anandkp92]

Semantic annotations are used to assign meaning to equipment and points defined in a model/CDL sequence from other standards such as Brick, Project-Haystack, ASHRAE 22p etc.

The latest draft of the annotations follows the following syntaxes:

annotation (__semanticData(metadataLanguageDefinition="<metadataLanguage> [version] [format]" "<description or URL>"))

annotation (__semanticData(metadataLanguage="<metadataLanguage> [version] [format]" "url=<reference://to/model.ttl>",    

annotation (__semanticData(metadataLanguage="<metadataLanguage> [version] [format]" "<metadata>"));

[mwetter]

@anandkp92 : If this has been fully addressed, please close the issue.