Add sources url to fabric.mod.json

Author: TechPro424

src/main/resources/fabric.mod.json

@@ -10,7 +10,7 @@
   ],
   "contact": {
     "homepage": "https://modrinth.com/user/TechPro424",
-    "sources": ""
+    "sources": "https://github.com/TechPro424/Item-Blacklist"
   },
 
   "license": "GNU Lesser General Public License v3.0 only",