Add tree example

examples/Console/Trees/Program.cs

@@ -0,0 +1,47 @@
+using Spectre.Console;
+
+namespace TableExample
+{
+    public static class Program
+    {
+        public static void Main()
+        {
+            var tree = new Tree();
+
+            tree.AddNode(new FigletText("Dec 2020"));
+            tree.AddNode(new Markup("[link]Click to go to summary[/]"));
+
+            // Add the calendar nodes
+            tree.AddNode(new Markup("[blue]Calendar[/]"),
+                node => node.AddNode(
+                    new Calendar(2020, 12)
+                        .AddCalendarEvent(2020, 12, 12)
+                        .HideHeader()));
+
+            // Add video games node
+            tree.AddNode(new Markup("[red]Played video games[/]"),
+                node => node.AddNode(
+                    new Table()
+                        .RoundedBorder()
+                        .AddColumn("Title")
+                        .AddColumn("Console")
+                        .AddRow("The Witcher 3", "XBox One X")
+                        .AddRow("Cyberpunk 2077", "PC")
+                        .AddRow("Animal Crossing", "Nintendo Switch")));
+
+
+            // Add the fruit nodes
+            tree.AddNode(new Markup("[green]Fruits[/]"), fruits =>
+                fruits.AddNode(new Markup("Eaten"),
+                    node => node.AddNode(
+                        new BarChart().Width(40)
+                            .AddItem("Apple", 12, Color.Red)
+                            .AddItem("Kiwi", 3, Color.Green)
+                            .AddItem("Banana", 21, Color.Yellow))));
+
+            AnsiConsole.WriteLine();
+            AnsiConsole.MarkupLine("[yellow]Monthly summary[/]");
+            AnsiConsole.Render(tree);
+        }
+    }
+}

examples/Console/Trees/Trees.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <ExampleTitle>Trees</ExampleTitle>
+    <ExampleDescription>Demonstrates how to render trees in a console.</ExampleDescription>
+    <ExampleGroup>Widgets</ExampleGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\src\Spectre.Console\Spectre.Console.csproj" />
+  </ItemGroup>
+
+</Project>