First commit. It works!

init.lua

@@ -0,0 +1,39 @@
+--- floating_anchor
+-- @module floating_anchor
+-- @release 0.1
+-- @copyright 2018 Starbeamrainbowlabs
+-- @license Mozilla Public License, 2.0 (MPL-2.0)
+-- @author Starbeamrainbowlabs
+
+local function log_message(level, msg)
+	minetest.log(level, "[floating-anchor] " .. msg)
+end
+
+minetest.register_node("floating_anchor:floating_anchor", {
+	description = "Floating Anchor (node - don't use)",
+	tiles = {"floating-anchor.png"},
+	groups = { cracky = 1 },
+	drop = "floating_anchor:floating_anchor_item"
+})
+
+minetest.register_craftitem("floating_anchor:floating_anchor_item", {
+	description = "Floating Anchor",
+	inventory_image = "floating-anchor.png",
+	on_use = function(itemstack, player, pointed_thing)
+		
+		-- user.getpos() -> {x, y, z}
+		
+		-- Figure out where to put the anchor
+		local place_position = player:getpos()
+		log_message("action", string.format("(%d, %d, %d)", place_position.x, place_position.y, place_position.z))
+		
+		-- Place the floating anchor in the world
+		minetest.set_node(place_position, { name = "floating_anchor:floating_anchor" })
+		
+		-- Take an item from the player's stack & return the new stack with 1 fewer items in it
+		local new_itemstack = itemstack:take_item(1)
+		return itemstack
+	end
+})
+
+log_message("info", "Loaded!")