Add bots? Well, to add bots you just specify how many you want to spawn with when you setup "Practice" mode.
But I don't think that's what you're asking.
To make bots functional in a map, you need to add what's called BotPathing. Basically, you create paths for the bots to follow, with each "node" in the path having its own parameters, such as "sniper spot" and of course objectives. The bots will spawn, analyze which route is the best, and advance.
As far as what's included in the SDK, that remains to be seen. Hopefull we will see it shortly.