Add initial FIGlet docs

docs/input/figlet.md

@@ -0,0 +1,33 @@
+Title: Figlet
+Order: 5
+---
+
+Spectre.Console can render [FIGlet](http://www.figlet.org/) text by using the `FigletText` class.
+
+# Default font
+
+```csharp
+AnsiConsole.Render(
+    new FigletText("Hello")
+        .LeftAligned()
+        .Color(Color.Red));
+```
+
+```text
+ _   _          _   _          
+| | | |   ___  | | | |   ___  
+| |_| |  / _ \ | | | |  / _ \ 
+|  _  | |  __/ | | | | | (_) |
+|_| |_|  \___| |_| |_|  \___/ 
+```
+
+# Custom font
+
+```csharp
+var font = FigletFont.Load("starwars.flf");
+
+AnsiConsole.Render(
+    new FigletText(font, "Hello")
+        .LeftAligned()
+        .Color(Color.Red));
+```