Simple list with things and the place where they are.
Download and install Visual Studio Community and Xamarin Platform from Xamarin download page.
Start a free Plan Spark on Google Firebase. Create a new project and add an android app with this package name (com.pove.cosas). You can use your own package name.
Open Cosas/MainActivity.cs
and set your Firebase variables:
// Firebase variables, you can set them up by code
private string ApplicationId = "";
private string ApiKey = "";
private string DatabaseUrl = "";
If you leave them empty, you will be asked for them on app start.