add Cozmo496@marco mod (#396)

This is my first mod surprisingly! Its a very simple mod that replaces
the lucky cat, with my cat.

mods/cozmo496@marco/description.md

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+A resource pack i made that replaces the lucky cat with my cat, Marco!
+
+Requires Malverk-1.1.3a  

mods/cozmo496@marco/meta.json

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+{
+  "title": "Marco",
+  "requires-steamodded": true,
+  "requires-talisman": false,
+  "categories": [
+    "Resource Packs"
+  ],
+  "author": "Cozmo496",
+  "repo": "https://github.com/Cozmo496/marco",
+  "downloadURL": "https://github.com/Cozmo496/marco/archive/refs/tags/marco4monthsold.zip",
+  "automatic-version-check": true,
+  "version": "v1.0"
+}