Add the game

mods/xcompat/doc/materials.md

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+# Materials API
+
+## Usage
+
+The materials can be accessed anywhere in your mod with `xcompat.materials.material_name`.
+
+Behind the scenes, xcompat automatically changes the `xcompat.materials`
+variable to contain the correct materials for whichever game the mod is
+launched in. 
+
+## Game support
+
+See the [the support table in the readme](https://github.com/mt-mods/xcompat/tree/master?tab=readme-ov-file#directly-supported-games-and-mods)
+for an overview of supported games, and see the contents of `/src/materials/`
+for the supported materials and their names. 
+
+## Examples
+
+Writing `xcompat.materials.steel_ingot` returns the string of whichever item
+would closest represent the `steel_ingot` material in the current game.
+
+The `/src/materials/mineclonia.lua` file shows what the keys of
+`xcompat.materials` resolve to when playing Mineclonia, such as
+`xcompat.materials.steel_ingot` resolving to `mcl_core:iron_ingot`, and
+`xcompat.materials.mesa_crystal` resolving to `mcl_redstone:redstone` if
+supported.