Add Riv_Falcon@MultiTextBox mod (#60)

A Balatro UI mod where you can separate massive description texts into
multiple boxes.

mods/Riv_Falcon@MultiTextBox/description.md

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+# MultiTextBox
+### A Balatro UI mod where you can separate massive description texts into multiple boxes.
+* Notice: This mod is passively supportive, which means:  
+ unless authors of the mods purposely made their mods compatible with this mod,  
+ this mod will _not_ be able to do anything if no compatible mod is around.  
+ (But it won't crash your game if said situation happens.)

mods/Riv_Falcon@MultiTextBox/meta.json

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+{
+  "title": "Multi Text Box",
+  "requires-steamodded": false,
+  "requires-talisman": false,
+  "categories": ["Miscellaneous"],
+  "author": "Riv_Falcon",
+  "repo": "https://github.com/RivFalcon/MultiTextBox",
+  "downloadURL": "https://github.com/RivFalcon/MultiTextBox/archive/latest/MultiTextBox.tar.gz"
+}