Add tasks for all the new languages

Task/Non-continuous-subsequences/Sidef/non-continuous-subsequences.sidef

@@ -0,0 +1,18 @@
+func non_continuous(min, max, subseq=[], has_gap=false) {
+
+    static current = [];
+
+    range(min, max).each { |i|
+        current.push(i);
+        has_gap && subseq.append([current...]);
+        i < max && non_continuous(i.inc, max, subseq, has_gap);
+        current.pop;
+        has_gap = current.len;
+    }
+
+    subseq;
+}
+
+say non_continuous(1, 3);
+say non_continuous(1, 4);
+say non_continuous("a", "d");