Add Tabularis ai detection submission

Author: Onlyartist9

leaderboard/submissions/tabularis-ai-detection/metadata.json

@@ -0,0 +1,9 @@
+{
+  "date_released": "2026-03-23",
+  "detector_name": "Tabularis ai detection",
+  "website": "",
+  "paper_link": "",
+  "huggingface_link": "",
+  "github_link": "",
+  "contact_info": "GitHub: https://github.com/Onlyartist9"
+}