You have to Create a wiki like website in Drupal using wikitools modules. It will be exactly like wiki but powered by Drupal. We will also have Yahoo Answers like facility in it where people can ask questions into it. I will give more details to people who are interested in it. If you are an Indian software development company than this will be really awesome though its not a necessary condition. You better be Really good in drupal and do shoe me your previous work with portfolio. We can talk about budget