First, A bot won't simply spawn without the developers console! Go to settings then Advanced and check Enable Developers Console if not checked.

|YOU NEED TO BE ON MULTIPLAYER FOR THIS TO WORK|

Make your own server in mutiplayer (Or join a sv_cheats 1 server.) and wait till it loads then access the Developers Console by pressing ` then type in bot then it will say Bot01 has joined the game.

Bots need training because they run into walls. Train them by going in the console then press bot_mimic 1. Optional: bot_mimic_yaw_offset 180.

You want to attack those bots but they're to scared to fight? Well use bot_mimic_yaw_offset 180 and then the bots will face you.