Add 'Note' to context.json and TERMS.md

```
{
...
"Note": {
"@id": "lrda:Note",
"@type": "@id"
}
...
}
```

Add this to the context.json file. Make sure to add a "Note" section to TERMS.md.

Open context.json and inspect its existing entries, then read TERMS.md to follow the format of its sections. Add the Note entry to context.json and a corresponding Note section to TERMS.md; done means both files contain the requested additions and remain valid and consistently formatted.

Written by the indexing model from the issue text.