title: How to store info about a user in a file and then read and modify them
body: <p>I'm trying to build a channel where users can update a bot message via command. The channel would work like this: if X sends <code>+ Item</code> the bot adds "Item" to an array linked to the user, that later is written on a file. To build the message, the bot reads the file and writes the elements of the array related to the user. How can I make that the array is someway linked to the user, like through the id, so that I can then read it? </p>
  
  <p>Thanks for the help</p>