Initial data commit

Task/Array-concatenation/Nemerle/array-concatenation.nemerle

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+using System.Console;
+using Nemerle.Collections;
+
+module ArrayCat
+{
+    Main() : void
+    {
+        def arr1 = array[1, 2, 3]; def arr2 = array[4, 5, 6];
+        def arr12 = arr1.Append(arr2);                       // <----
+        foreach (i in arr12) Write($"$i  ");
+    }
+}