Add Readme

Author: hkzorman

Diff for: readme.md

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+Itemshelf
+=========
+
+The item shelf mod is a simple mod that adds to shelves that can hold up to 4 or 6 items. This small limitation is due to the fact that shelves show the items they are holding using entities. The entities are purely static and consume 0 CPU (like the ones in itemframes for example), but still the limitation is to avoid lag.
+
+There are no crafting recipes at the moment. To get an item shelf, play on `creative` or use:
+`/giveme itemshelf:small_shelf` or `/giveme itemshelf:large_shelf`. Both shelves are of the same size, however they can hold 4 or 6 items respectively. 
+
+Developers
+----------
+Developers using this mod can register a particular node to use the item shelf functionality. To do that, the following function is used:
+```lua
+itemshelf.register_shelf(name, def)
+```
+where `name` is the name of the node (`itemshelf:` will be the prefix) and `def` is a Lua table defining the following:
+  - `description`: shown in inventory
+  - `textures` (if drawtype is nodebox)
+  - `nodebox` (like default minetest.register_node def). Do not use with `mesh`.
+  - `mesh` (like default minetest.register_node def). Do not use with `nodebox`.
+  - `item capacity` (how many items will fit into the shelf, use even numbers, max 16)
+  - `shown_items` (how many items to show, will always show first (shown_items/2) items of each row, max 6)
+
+License
+-------
+All code is copyright (C) 2018 Hector Franqui (zorman2000), licensed under the MIT license. See `LICENSE` for details.
+
+Roadmap
+-------
+  - Add shelves in all varieties of woods
+  - Add crafting recipe
+  - Add sounds when placing items
+  - Allow shelves to contain only specific items
+  - Allow overlays if shelf holds specific items