Might be this

c = require("component")
gpu = c.gpu
term = require("term")
fs = require("filesystem")

todo=nil
todo={}

function getList()
    list = fs.open("home/todolist.txt", "r")
        for k,v in pairs(list) do
            table.insert(v, todo)
        end
    list:close()
end

getList()
for k,v in pairs(todo) do
    print(k..": "..v)
end