Add description of features.

Signed-off-by: gogojesse <gogojesseco@gmail.com>
<a href='#crh-start'></a><a href='#crh-data-%7B%22approved%22%3A%20%7B%22https%3A//github.com/gogojesse%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/9361599%3Fv%3D3%22%7D%7D%2C%20%22comments%22%3A%20%7B%22General%20Comment%22%3A%20%7B%22html_url%22%3A%20%22https%3A//github.com/gogojesse/gos/pull/5%23issuecomment-63643171%22%2C%20%22comments%22%3A%20%5B%7B%22body%22%3A%20%22%3Ashipit%3A%22%2C%20%22created_at%22%3A%20%222014-11-19T14%3A00%3A58Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/9361599%3Fv%3D3%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/gogojesse%22%7D%7D%2C%20%7B%22body%22%3A%20%22%3Ashipit%3A%22%2C%20%22created_at%22%3A%20%222014-11-19T14%3A02%3A38Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/9361599%3Fv%3D3%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/gogojesse%22%7D%7D%5D%2C%20%22title%22%3A%20%22General%20Comment%22%7D%7D%2C%20%22processed%22%3A%20%5B%22https%3A//github.com/gogojesse/gos/pull/5%23issuecomment-63643171%22%2C%20%22https%3A//github.com/gogojesse/gos/pull/5%23issuecomment-63643376%22%5D%7D'></a>
<a href='https://www.codereviewhub.com/'><img src='http://www.codereviewhub.com/site/github-bar.png' height=40></a>

<img src='http://www.codereviewhub.com/site/github-approved-avatar.png'><a href='https://github.com/gogojesse'><img src='https://avatars.githubusercontent.com/u/9361599?v=3' width=34 height=34></a>

<a href='https://www.codereviewhub.com/gogojesse/gos/pull/5?approve=1'><img src='http://www.codereviewhub.com/site/github-approve.png' height=26></a>&nbsp;<a href='https://www.codereviewhub.com/gogojesse/gos/pull/5?approve=0'><img src='http://www.codereviewhub.com/site/github-undo-approve.png' height=26></a>&nbsp;<a href='https://github.com/gogojesse/gos/pull/5'><img src='http://www.codereviewhub.com/site/github-refresh.png' height=26></a>
<a href='#crh-end'></a>