Add multiple cons pattern example to F# pattern matching documentation

docs/fsharp/language-reference/pattern-matching.md

@@ -138,6 +138,10 @@ The cons pattern is used to decompose a list into the first element, the *head*,
 
 [!code-fsharp[Main](~/samples/snippets/fsharp/lang-ref-2/snippet4809.fs)]
 
+You can also chain multiple cons patterns together to match lists that start with specific sequences of elements.
+
+[!code-fsharp[Main](~/samples/snippets/fsharp/lang-ref-2/snippet4819.fs)]
+
 ## List Pattern
 
 The list pattern enables lists to be decomposed into a number of elements. The list pattern itself can match only lists of a specific number of elements.

samples/snippets/fsharp/lang-ref-2/snippet4819.fs

@@ -0,0 +1,13 @@
+let charList = ['A'; 'B'; 'C'; 'D']
+
+// This example demonstrates multiple cons patterns.
+let matchChars xs =
+    match xs with
+    | 'A'::'B'::t -> printfn "starts with 'AB', rest: %A" t
+    | 'A'::t -> printfn "starts with 'A', rest: %A" t
+    | 'C'::'D'::t -> printfn "starts with 'CD', rest: %A" t
+    | _ -> printfn "does not match"
+
+matchChars charList
+matchChars ['A'; 'X']
+matchChars ['C'; 'D'; 'E']