HOW CAN ADD EXTENSION

function getPosByDir()
    local dirs = { { 0, -1 }, { 1, 0 }, { 0, 1 }, { -1, 0 }}
    local dir = player:getDirection() + 1
    local dirPos = pos()
    dirPos.x = dirPos.x + dirs[dir][1]
    dirPos.y = dirPos.y + dirs[dir][2]
 
    return dirPos.x .. "," .. dirPos.y .. "," .. dirPos.z
  end
 
  CaveBot.Extensions.dropItem = {}
 
  CaveBot.Extensions.dropItem.setup = function()
    CaveBot.registerAction("drop", "orange", function(value, retries)
      local val = string.split(value, ",")
      local itemid = nil
      local count = nil
      local tries = nil
      if #val >= 4 then
        itemid = tonumber(val[4])
      end
      if #val == 5 then
        tries = tonumber(val[5])
      end
 
      if not val[1] or not val[2] or not val[3] then
        warn("CaveBot[Drop]: invalid value. It should be position (x,y,z), is: " .. value)
        return false
      end
 
      if retries >= (tries and tries or 20) then
        print("CaveBot[Drop]: too many tries, can't open hole")
        return false -- tried 20 times, can't drop
      end
 
      local pos = {x=tonumber(val[1]), y=tonumber(val[2]), z=tonumber(val[3])} 
 
      local dropTile = g_map.getTile(pos)
      if not dropTile then
        return "retry"
      end
 
      local holeitem = dropTile:getTopThing()
      if holeitem and holeitem:getId() == itemid then
        return true
      end
 
      local item = findItem(itemid)
      if item then
        g_game.move(item, pos, 1)
        CaveBot.delay(1000)
      end
      return "retry"
    end)
  CaveBot.Editor.registerAction("drop", "drop", {
      value=function() return getPosByDir() end,
      title="Drop",
      description="Drop item to position (x,y,z), itemid, retries(optional) ",
      multiline=false,
  })
  end