Update sheet.json

added compendium property to sheet.json file

Fate/sheet.json

@@ -5,6 +5,7 @@
 	"roll20userid": "3844812 (Evil Hat Productions)",
 	"preview": "FateOmni.png",
 	"instructions": "For more information about this highly versatile sheet, check out our series of posts at Evil Hat: https://www.evilhat.com/home/fate-on-roll20-part-1-character-sheet-setup/ -- and if you run into any issues, have suggestions, or anything else, please reach out to Evil Hat at feedback@evilhat.com. If you're a sheet developer and looking to make changes to this sheet's code, don't. We maintain an external copy as the authoritative source; problems that emerge with the sheet are our customer service problem, not yours. Changes you make are likely to be erased. So talk to us before making changes.",
+	"compendium": "fate",
 	"useroptions": [  
 		{
 			"attribute": "setgame",