title: How to programmatically add Tilemaps to a Grid
body: <p>I am new to Unity3d and I'm trying to make my first 2d game.<br>
  In order to create Tilemaps in Unity, we usually <code>right-click then choose 2D Object &gt; Tilemap</code>, which gives us a Grid + Tilemap, each child tilemap in that grid is considered a layer.</p>
  
  <p>What I want is to be able to generate/add tilemaps with a script to an empty Grid (everytime empty the Grid then add layers).</p>
  
  <p>I want to make a map system where the map is generated using binary files every time the player changes the map.</p>
  
  <p>Is that possible?</p>