Initial commits

examples/Console/AlternateScreen/Program.cs

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+// Check if we can use alternate screen buffers
+using Spectre.Console;
+
+if (!AnsiConsole.Profile.Capabilities.AlternateBuffer)
+{
+    AnsiConsole.MarkupLine(
+        "[red]Alternate screen buffers are not supported " +
+        "by your terminal[/] [yellow]:([/]");
+
+    return;
+}
+
+// Write to the terminal
+AnsiConsole.Write(new Rule("[yellow]Normal universe[/]"));
+AnsiConsole.Write(new Panel("Hello World!"));
+AnsiConsole.MarkupLine("[grey]Press a key to continue[/]");
+AnsiConsole.Console.Input.ReadKey(true);
+
+AnsiConsole.AlternateScreen(() =>
+{
+    // Now we're in another terminal screen buffer
+    AnsiConsole.Write(new Rule("[red]Mirror universe[/]"));
+    AnsiConsole.Write(new Panel("[red]Welcome to the upside down![/]"));
+    AnsiConsole.MarkupLine("[grey]Press a key to return[/]");
+    AnsiConsole.Console.Input.ReadKey(true);
+});