Add boats README

mods/ITEMS/mcl_boats/README.txt

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+# mcl_boats
+This mod adds drivable boats.
+
+# Credits
+## Mesh
+Boat mesh (`models/boat.b3d`) created by 22i.
+Source: https://github.com/22i/minecraft-voxel-blender-models
+
+License of boat model:
+GNU GPLv3 <https://www.gnu.org/licenses/gpl-3.0.html>
+
+## Textures
+All textures are from the Faithful texture pack for Minecraft.
+See the main MineClone 2 license to learn more.
+
+## Code
+Code based on Minetest Game, licensed under the MIT License (MIT).
+
+Authors include:
+* PilzAdam (2012-2016)
+* Various Minetest / Minetest Game developers and contributors (2012-2016)
+* maikerumine (2017)
+* Wuzzy (2017)
+