Update README.md

Author: hathach

README.md

@@ -15,15 +15,18 @@ Supported device class drivers are:
 - Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ...
 - Mass Storage Class (MSC): with multiple LUNs
 - Musical Instrument Digital Interface (MIDI)
+- Video (UVC): work in progress
 - WebUSB with vendor specific class
 
 ### Host Stack
 
-Host support is still work-in-progress but currently available with rp2040 core thanks to [Pico-PIO-USB](https://github.com/sekigon-gonnoc/Pico-PIO-USB). Supported class driver are:
+Host stack is available with either addition of MAX3421E hardware (e.g [Host FeatherWing](https://www.adafruit.com/product/5858)) or  rp2040 core (thanks to [Pico-PIO-USB](https://github.com/sekigon-gonnoc/Pico-PIO-USB)). Supported class driver are:
 
-- Communication (CDC)
+- Communication (CDC): including vendor usb2uart such as FTDI, CP210x, CH34x
 - MassStorage class
 
+Noe: Host stack is still work-in-progress
+
 ## Supported Cores
 
 There are 2 type of supported cores: with and without built-in support for TinyUSB. Built-in support provide seamless integration but requires extra code added to core's source code. Unfortunately it is not always easy or possible to make those modification.