FPA: Added .NET API calls

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/dotnet/FPRMSort.cs

@@ -0,0 +1,43 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    FPRMSort.cs
+
+Abstract:
+
+    Z3 Managed API: Floating Point Rounding Mode Sorts
+
+Author:
+
+    Christoph Wintersteiger (cwinter) 2013-06-10
+
+Notes:
+    
+--*/
+
+using System;
+using System.Diagnostics.Contracts;
+
+namespace Microsoft.Z3
+{
+    /// <summary>
+    ///  A floating point rounding mode sort
+    /// </summary>
+    public class FPRMSort : Sort
+    {
+        #region Internal
+        internal FPRMSort(Context ctx, IntPtr obj)
+            : base(ctx, obj)
+        {
+            Contract.Requires(ctx != null);
+        }
+        internal FPRMSort(Context ctx)
+            : base(ctx, Native.Z3_mk_fpa_rounding_mode_sort(ctx.nCtx))
+        {
+            Contract.Requires(ctx != null);
+        }
+        #endregion
+    }
+}