add vallkarri cryptid addon (#327)

i do not have much to say about this

mods/Lily@VallKarri/description.md

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+# VallKarri
+Yet another expansion upon Cryptid, balanced around the Madness gameset.
+Over 70 new Jokers, and plenty of content, with much more planned, including variants of *every* vanilla joker!

mods/Lily@VallKarri/meta.json

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+{
+  "title": "VallKarri",
+  "requires-steamodded": true,
+  "requires-talisman": true,
+  "categories": ["Content", "Joker", "Miscellaneous"],
+  "author": "Lily",
+  "repo": "https://github.com/real-niacat/VallKarri",
+  "downloadURL": "https://github.com/real-niacat/VallKarri/archive/refs/heads/master.zip",
+  "folderName": "VallKarri",
+  "version": "0.7.1",
+  "automatic-version-check": true
+}