Add SamTB@BalatroGardens mod (#454)

Disclaimer: All of the songs and their covers are Royalty Free, plus the
artist is ok with this mod using them.

mods/SamTB@BalatroGardens/description.md

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+# Balatro Gardens
+A Balatro mod themed around the Ghost Gardens album by Unlike Pluto. This mod adds a new joker rarity and 16 new items of content, 15 of which are based on the songs in the album.

mods/SamTB@BalatroGardens/meta.json

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+{
+  "title": "Balatro Gardens",
+  "requires-steamodded": true,
+  "requires-talisman": false,
+  "categories": [ "Content" ],
+  "author": "SamTB",
+  "repo": "https://github.com/samtabareh/Balatro-Gardens",
+  "downloadURL": "https://github.com/samtabareh/Balatro-Gardens/archive/refs/heads/main.zip",
+  "folderName": "BalatroGardens",
+  "version": "v0.1.2",
+  "automatic-version-check": true
+}