Add tasks for all the new languages

Task/Self-describing-numbers/Sidef/self-describing-numbers-1.sidef

@@ -0,0 +1,16 @@
+func sdn(n) {
+    var b = [0]*n.len;
+    var a = n.chars;
+    a.each { |i| b[i] := 0 ++ }
+    a.join == b.join;
+}
+
+var values = <1210 2020 21200 3211000
+42101000 521001000 6210001000 27 115508>;
+
+values.each { |test|
+    say "#{test} is #{sdn(test) ? '' : 'NOT ' }a self describing number.";
+}
+
+say "\nSelf-descriptive numbers less than 1e5 (in base 10):"
+0.to(1e5).each { |i| say i if sdn(i.to_s) }

Task/Self-describing-numbers/Sidef/self-describing-numbers-2.sidef

@@ -0,0 +1,4 @@
+7.to(36).each { |b|
+    var n = ((b-4) * b**(b-1) + 2*(b**(b-2)) + b**(b-3) + b**3 -> base(b));
+    say "base #{'%2d' % b}: #{n}";
+}