Add tasks for all the new languages

Task/Subtractive-generator/Sidef/subtractive-generator.sidef

@@ -0,0 +1,22 @@
+class SubRandom(seed, state=[]) {
+
+    const mod = 1_000_000_000;
+
+    method init {
+        var s = [seed % mod, 1];
+        53.times {
+            s.append((s[-2] - s[-1]) % mod);
+        }
+        state = s.range.map {|i| s[(34 + 34*i) % 55] };
+        range(55, 219).each { self.subrand };
+    }
+
+    method subrand {
+        var x = ((state.shift - state[-24]) % mod);
+        state.append(x);
+        return x;
+    }
+}
+
+var r = SubRandom(292929);
+10.times { say r.subrand };