hide deprecated code; make USB snippet common for F0/F1/F3

F0:F030,F042,F072/Readme.md

@@ -5,18 +5,15 @@ This directory contains examples for F0 without any library
 
 - **3steppersLB** - control independent moving of 3 stepper motors with encoders (by USB and CAN bus)
 - **blink** - simple LED blink
-- **canbus** - simplest CAN bus development board
 - **CANbus4BTA** - (under development) device to replace old PEP-CAN @BTA
 - **CANBUS_SSI** - work with BTA SSI azimutal encoder
-- **CANbus_stepper** - (under development) stepper motor management over CAN-bus, USB and RS-485
 - **Chiller** - simplest chiller controller
 - **F0_testbrd** - sample code for STM32F0x2 checking via test board
 - **htu21d_nucleo** - operaing with HTU-21D in STM32F042-nucleo
 - **inc** - all encludes need
 - **morze** - for STM32F030, echo data from USART1 on TIM3CH1 (PA6) as Morze code
 - **NUCLEO_SPI** - tests of SSI over SPI
-- **pl2303** - CDC template (emulation of PL2303) (*deprecated*)
-- **PL2303_ringbuffer** - emulation of PL2303 with ring buffers on USB Rx/Tx (USE THIS instead of `pl2303`!!!)
+- **PL2303_ringbuffer** - emulation of PL2303 with ring buffers on USB Rx/Tx 
 - **QuadEncoder** - sample code for working with quadrature encoder (via timer)
 - **Servo** - simple servo (like SG-90) controller
 - **Snippets** - some small code snippets
@@ -26,8 +23,6 @@ This directory contains examples for F0 without any library
 - **uart_blink** - code for STM32F030F4, echo data on USART1 and blink LEDS on PA4 and PA5
 - **uart_blink_dma** - USART over DMA
 - **uart_nucleo** - USART over DMA for STM32F042-nucleo
-- **usbcan** - USB--CAN adapter using PL2303 emulation (*deprecated*)
 - **usbcan_relay** - relay and some other management board over CAN bus
-- **usbcan_ringbuffer** - USB--CAN adapter (USE THIS instead of `usbcan`!!!)
+- **usbcan_ringbuffer** - USB--CAN adapter
 - **USBHID** - USB HID keyboard + mouse
-- **USB_pl2303_snippet** - full minimal snippet of PL2303 emulation for STM32F072xB (*deprecated*)

F0:F030,F042,F072/deprecated/Readme.md

@@ -0,0 +1,10 @@
+Samples for STM32F042-nucleo and chinese STM32F030-based devboard
+=================================
+
+This directory contains examples for F0 without any library
+
+- **canbus** - simplest CAN bus development board
+- **CANbus_stepper** - (under development) stepper motor management over CAN-bus, USB and RS-485
+- **pl2303** - CDC template (emulation of PL2303) (*deprecated*)
+- **usbcan** - USB--CAN adapter using PL2303 emulation (*deprecated*)
+- **USB_pl2303_snippet** - full minimal snippet of PL2303 emulation for STM32F072xB (*deprecated*)