Add tasks for all the new languages

Task/Amicable-pairs/Sidef/amicable-pairs.sidef

@@ -0,0 +1,15 @@
+func propdivsum(x) {
+    gather {
+        2.to(x.isqrt).each { |d|
+            if (x %% d) {
+                take(d)
+                take(x/d) if !x.is_sqr
+            }
+        }
+    }.sum(x > 0 ? 1 : 0)
+}
+
+1.to(20000).each { |i|
+    var j = propdivsum(i)
+    say "#{i} #{j}" if (j>i && i==propdivsum(j))
+}