adds Gemstones (#9)

mods/Halo@Gemstones/description.md

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+# Gemstones
+Gemstones is a Balatro mod that adds a new unique card modifier: **Gem Slots**! Gem Slots can be obtained in multiple ways, and can hold Gemstones.
+
+## How do I get Gemstones?
+Gemstones can be found from either the shop or a Gemstone Booster Pack, which contains 3 Gemstone cards and a copy of The Infusion tarot. There are other ways as well, such as from a The Excavator tarot or from a tag.
+
+## How do I apply a Gemstone?
+You can apply a Gemstone to a card or Joker (depending on what the description says) if it has a Gem Slot applied. If there is no Gem Slot, you can apply one by using a new tarot called The Infusion, which applies an Empty Gem Slot to 2 highlighted cards or Jokers.
+
+## Extra Content
+There is extra content built around the mod that can be enabled/disabled from the Conifg. The extra content are Jokers, Tags, Challenges, Vouchers, Blinds, and Decks.

mods/Halo@Gemstones/meta.json

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+{
+    "title": "Gemstones",
+    "requires-steamodded": true,
+    "categories": ["Content"],
+    "author": "Halo / OfficialHalo",
+    "repo": "https://github.com/0fficialHalo/Gemstones",
+    "downloadURL": "https://github.com/0fficialHalo/Gemstones/releases/latest/Gemstones.zip"
+  }