Add tasks for all the new languages

Task/List-comprehensions/Sidef/list-comprehensions.sidef

@@ -0,0 +1,10 @@
+var n = 20
+say gather {
+    for x in (1 .. n) {
+        for y in (x .. n) {
+           for z in (y .. n) {
+             take([x,y,z]) if (x*x + y*y == z*z)
+           }
+        }
+    }
+}