Add example Explicit Loading function.

EntityFrameworkCore.Console/Program.cs

@@ -15,6 +15,29 @@ context.Database.EnsureCreated();
 // Rather than raise: "System.InvalidOperationException: Sequence contains no elements."
 // var firstCoach = await context.Coaches.FirstOrDefaultAsync();
 
+await ExplicitLoadingExample();
+
+async Task ExplicitLoadingExample()
+{
+  var league = await context.FindAsync<League>(1);
+  if (!league.Teams.Any())
+  {
+    Console.WriteLine("Teams have not been loaded.");
+  }
+
+  await context.Entry(league)
+    .Collection(l => l.Teams)
+    .LoadAsync();
+
+  if (league.Teams.Any())
+  {
+    foreach (var team in league.Teams)
+    {
+      Console.WriteLine($"{team.Name}");
+    }
+  }
+}
+
 async Task EagerLoadingExample()
 {
   var leagues = await context.Leagues