[#267]add info about number of competitors

![zrzut ekranu z 2014-05-26 13 06 11](https://cloud.githubusercontent.com/assets/1115619/3081865/ae5cb22e-e4c7-11e3-865c-ca53cb5a2d77.png)
https://netguru.co/blog/posts/how-to-join-at-netguru-in-5-steps