Add colonthreeing@CreditLib mod (#316)

This is an API mod to easily add credit badges to cards.

mods/colonthreeing@CreditLib/description.md

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+# CreditLib
+Adds a simple interface for adding credit badges to cards, based on Cryptid's credit system.

mods/colonthreeing@CreditLib/meta.json

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+{
+  "title": "CreditLib",
+  "requires-steamodded": true,
+  "requires-talisman": false,
+  "categories": ["API"],
+  "author": "colonthreeing",
+  "repo": "https://github.com/colonthreeing/CreditLib",
+  "downloadURL": "https://github.com/colonthreeing/CreditLib/releases/latest/download/CreditLib.zip",
+  "folderName": "CreditLib",
+  "version": "0.3.1",
+  "automatic-version-check": true
+}