Update README.md

Author: PCrnjak

README.md

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-**Sign up and get notified when available: https://source-robotics.com**
 
 Spectral Micro is a brushless motor controller designed to offer affordable and capable hardware, complemented by open-source software. 
 * It supports multiple firmware options and integrates a 14-bit magnetic encoder, inline current sensing, CAN and UART data interface, and provides support for position, velocity, torque, and impedance control.