Add tasks for all the new languages

Task/Write-float-arrays-to-a-text-file/Sidef/write-float-arrays-to-a-text-file.sidef

@@ -0,0 +1,14 @@
+func writedat(filename, x, y, x_precision=3, y_precision=5) {
+    var fh = File.new(filename).open_w;
+
+    MultiArray.new(x, y).each { |x, y|
+        fh.printf("%.*g\t%.*g\n", x_precision, x, y_precision, y);
+    }
+
+    fh.close;
+}
+
+var x = [1, 2, 3, 1e11];
+var y = x»sqrt»();
+
+writedat('sqrt.dat', x, y);