Add tasks for all the new languages

Task/100-doors/Sidef/100-doors-1.sidef

@@ -0,0 +1,13 @@
+var doors = []
+
+100.times { |pass|
+    100.times { |i|
+        if (i % pass == 0) {
+            doors[i] := false -> not!
+        }
+    }
+}
+
+100.times { |i|
+    "Door %3d is %s\n".printf(i, doors[i] ? 'open' : 'closed')
+}

Task/100-doors/Sidef/100-doors-2.sidef

@@ -0,0 +1,3 @@
+{ |i|
+    "Door %3d is %s\n".printf(i, ["closed", "open"][i.is_sqr])
+} * 100