A good introduction would obviously address the topic question. It must be interesting so as to grasp the reader/marker's attention, not to make them feel like "omg do I have to read this?"
The conclusion must be like saying your whole argument in one paragraph. Don't add anything new.
A good introduction wouldn't just restate the question. If your given a question, it will usually ask to dicuss/ explore/examine, etc. So you should express what your going to be talking about in your essay and your opinion of the text. (But this doesnt mean you say I feel...etc). It should show how the theme and text relate to the question. Try to make it succint.