[FAQ.mdx] Added a FAQ section

Author: juanjqo

website/docs/FAQ.mdx

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+### Can I use the SmartArmStack libraries without ROS/ROS 2?
+
+Yes! The [**SmartArmStack**](https://github.com/SmartArmStack) packages provide modularized 
+robot control tools for ROS and ROS 2. Each device can be used directly through C++ or 
+Python without ROS, through their **sas_robot_driver** interfaces. 
+Then, using inheritance and subclass polymorphism, each device is individually managed 
+through ROS by an instance of **sas_robot_driver_ros**. 
+In general, each robotic device will have different configuration requirements and 
+those are handled in a modular way through configuration files.
+
+### What robots are supported in SmartArmStack?
+
+Roughly speaking, all robots, sensors, and actuators are compatible with the [**SmartArmStack**](https://github.com/SmartArmStack)
+framework as long as you implement their respective **sas_robot_driver** interfaces. 
+
+