Add new itemframes documentation

mods/ITEMS/mcl_itemframes/API.md

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+# mcl_itemframes
+## Functions
+* mcl_itemframes.register_itemframe(name, itemframe_definition)
+* mcl_itemframes.remove_entity(pos)
+	* Removes the item entity belonging to the itemframe at `pos`, does not delete the item(inventory) of the itemframe.
+* mcl_itemframes.update_entity(pos)
+	* Updates the item entity belonging to the itemframe at `pos` according to it's set item (node inventory)
+
+## Itemframe definition
+
+```lua
+{
+	node = {
+		description = "My cool Frame",
+		tiles = { "my_texture.png"},
+		-- ... this can contain any node definition fields which will be used for the itemframe node
+	},
+	object_properties = {
+		glow = 15,
+		-- ... this can contain any object properties which will be applied to the item entity
+	},
+}
+```