slime-trials: add missing git repository

Author: avivace

entries/canight__slime-trials/game.json

@@ -23,5 +23,6 @@
     "title": "Slime Trials",
     "date": "2023-09-15",
     "website": "https://canight.itch.io/slime-trials",
-    "slug": "canight__slime-trials"
-}
+    "slug": "canight__slime-trials",
+    "repository": "https://github.com/Canite/SlimeTrials"
+}