Add tasks for all the new languages

Task/Sorting-algorithms-Quicksort/Crystal/sorting-algorithms-quicksort.crystal

@@ -0,0 +1,9 @@
+def quick_sort(a : Array(Int32)) : Array(Int32)
+  return a if a.size <= 1
+  p = a[0]
+  lt, rt = a[1 .. -1].partition { |x| x < p }
+  return quick_sort(lt) + [p] + quick_sort(rt)
+end
+
+a = [7, 6, 5, 9, 8, 4, 3, 1, 2, 0]
+puts quick_sort(a) # => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]