[rt-thread] add rt-thread os in readme
@@ -90,6 +90,7 @@ TinyUSB is completely thread-safe by pushing all Interrupt Service Request (ISR)
- **No OS**
- **FreeRTOS**
+- **RT-Thread** (https://github.com/tfx2001/tinyusb)
- **Mynewt** Due to the newt package build system, Mynewt examples are better to be on its [own repo](https://github.com/hathach/mynewt-tinyusb-example)
Local Docs
