text: Title: Map.addLayerControl() doesn't seem to be working
  Body: <!-- Please search existing issues to avoid creating duplicates. -->
  
  ### Environment Information
  
  -   geemap version:  0.13.1
  -   Python version:  3.9.12 (conda 4.12.0)
  -   Operating System: Windows 11
  
  ### Description
  
  I'm new to geemap and was looking around a bit and following along the instructions on this page:
  [https://geemap.org/notebooks/geemap_and_folium]
  
  ### What I Did
  
  in cell [18]
  ```
  Map.addLayerControl()
  Map
  ```
  
  No layercontrol appeared in the top-right of the map, as I was expecting (like in folium/leaflet)
  In the later steps adding the various basemaps.. they couldn't be found either
  
  seems something  is broken, or I am doing something quite wrong :(
  
  this is the final image after executing cell [21]. pretty bare :(
  ![image](https://user-images.githubusercontent.com/3451729/163252257-121227a9-f0b4-4516-b999-8ebd9811395b.png)
  