onboard F# sample

Chapter02/FS/Greetings/README.md

@@ -1,6 +1,6 @@
 ---
 name: 'Xamarin.Forms Book - Greetings F#'
-description: "Simple Xamarin.Forms application written in F# #getstarted"
+description: "Simple Xamarin.Forms app written in F# #getstarted"
 page_type: sample
 languages:
 - fsharp

Chapter02/FS/Hello/README.md

@@ -1,6 +1,6 @@
 ---
 name: 'Xamarin.Forms Book - Hello F#'
-description: "Simple Xamarin.Forms application written in F# #getstarted"
+description: "Simple Xamarin.Forms app written in F# #getstarted"
 page_type: sample
 languages:
 - fsharp

Chapter03/FS/VariableFormText/README.md

@@ -0,0 +1,31 @@
+---
+name: 'Xamarin.Forms Book - VariableFormattedText F#'
+description: "Xamarin.Forms app with formatted text spans, written in F#"
+page_type: sample
+languages:
+- fsharp
+products:
+- xamarin
+urlFragment: chapter03-fs-variableformtext
+---
+# Greetings F\#
+
+Simple Xamarin.Forms application written in F#, showing formatted text spans:
+
+```fsharp
+type VariableFormattedTextPage() =
+    inherit ContentPage()
+    let formattedString = FormattedString()
+    let largeSize = Device.GetNamedSize(NamedSize.Large, typeof<Label>)
+
+    do formattedString.Spans.Add(Span(Text = "I "))
+    do formattedString.Spans.Add(Span(Text = "love",
+                                      FontSize = largeSize,
+                                      FontAttributes = FontAttributes.Bold))
+    do formattedString.Spans.Add(Span(Text = " Xamarin.Forms"))
+
+    do base.Content <- Label(FormattedText = formattedString,
+                             VerticalOptions = LayoutOptions.Center,
+                             HorizontalOptions = LayoutOptions.Center,
+                             FontSize = largeSize)
+```