Update examples to net6.0

Closes #604

examples/Console/Minimal/GlobalUsings.cs

@@ -0,0 +1,2 @@
+global using Spectre.Console;
+global using static Spectre.Console.AnsiConsole;

examples/Console/Minimal/Minimal.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ExampleTitle>Minimal</ExampleTitle>
+    <ExampleDescription>Demonstrates a minimal console application.</ExampleDescription>
+    <ExampleGroup>Live</ExampleGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Shared\Shared.csproj" />
+  </ItemGroup>
+
+</Project>

examples/Console/Minimal/Program.cs

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+// Write a markup line to the console
+MarkupLine("[yellow]Hello[/], [blue]World[/]!");
+
+// Write text to the console
+WriteLine("Hello, World!");
+
+// Write a table to the console
+Write(new Table()
+    .RoundedBorder()
+    .AddColumns("[red]Greeting[/]", "[red]Subject[/]")
+    .AddRow("[yellow]Hello[/]", "World")
+    .AddRow("[green]Oh hi[/]", "[blue u]Mark[/]"));
+