Need a software documentator

We have recently launched a web based software and are looking for someone who can document its features and how-to's in a Wiki (installed already). You must be good with the technical writing and have great willingness to dive into the software upto the core to understand all its feature. Our team members will help you out understanding the features if needed - but more you can handle yourself - better for us. We'll provide details to the winning bidder. Also, the software is a web based script, so anyone who has worked with similar thing will be preferred. Professionals from New Delhi, India are preferred. Our estimated time for this work is 20 hours max. excluding the time to understand the software. Budget: $100 max.