Since 0.3.0, the player can steal money from others. To do so, he'll have to move next to his target, select this target and interact with it (U key or with the mouse Right Click / pickpocket). Your Agility and your Stealth will be compared to the target's Perception.
If you are successful, your Stealth skill will increase a bit and you will receive some funds from your target while remaining undetected. Otherwise, your Alert Level will increase and the NPC may flee or react aggressively.