feat: add a new icon

Author: WhatDamon

src/main/resources/assets/performtracker/icon.png

@@ -8,7 +8,8 @@
 		"WhatDamon"
 	],
 	"contact": {
-		"sources": "https://github.com/WhatDamon/PerformTracker-Mod"
+		"sources": "https://github.com/WhatDamon/PerformTracker-Mod",
+		"issues": "https://github.com/WhatDamon/PerformTracker-Mod/issues"
 	},
 	"license": "Apache 2.0",
 	"icon": "assets/performtracker/icon.png",