title: RecyclerView Sections and data from Firebase
body: <p>Hi I'm working on an app, in it I have to populate a data recyclerview with Firebase, ready.
  Now I want to do is fill out a recyclerview with data firebase but has sections which would be the father that host data firebase, I'm a little lost with this, and I think it is in the adapter Recyclerview where not as do, I hope you can help me.
  Sorry for my English, it's not good.</p>
  
  <p><img src="https://i.stack.imgur.com/C9xzD.png" alt="Image with what I want to do"></p>
  
  <p>Thanks! and i am sorry for my english.</p>