Merge pull request #606 from nasanos/quick_sort-FSharp

Added quick sort in F#

Author: t2013anurag

sorting/quick_sort/quick_sort.fsx

@@ -0,0 +1,6 @@
+let rec quicksort list =
+    match list with
+    | []    -> []
+    | x::xs ->
+        let smaller, larger = List.partition (fun y -> y < x) xs
+        in List.concat [quicksort smaller; [x]; quicksort larger]