[variant] Add Generic F1xx

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>

README.md

@@ -181,7 +181,8 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart:  | STM32F103C6<br>STM32F103C8<br>STM32F103CB | [Blue Pill](https://stm32-base.org/boards/STM32F103C8T6-Blue-Pill) | *1.2.0* | USB CDC support since *1.5.0*<br> Maple bootloaders support since *1.6.0* |
 | :green_heart:  | STM32F103C8<br>STM32F103CB | [Black Pill](https://stm32-base.org/boards/STM32F103C8T6-Black-Pill) | *1.5.0* |  |
 | :green_heart:  | STM32F103C4<br>STM32F103C6<br>STM32F103C8<br>STM32F103CB | Generic Board | *1.9.0* |  |
-| :green_heart:  | STM32F103R6<br>STM32F103R8<br>STM32F103RB<br>STM32F103RC<br>STM32F103RD<br>STM32F103RE<br>STM32F103RF<br>STM32F103RG | [Generic Board](https://stm32-base.org/boards/STM32F103RET6-Generic-Board) | *1.9.0* |  |
+| :green_heart:  | STM32F103R8<br>STM32F103RB<br>STM32F103RC<br>STM32F103RE | [Blue Button F103Rx](https://stm32-base.org/boards/STM32F103RET6-Generic-Board) | *1.9.0* |  |
+| :green_heart:  | STM32F103R6<br>STM32F103R8<br>STM32F103RB<br>STM32F103RC<br>STM32F103RD<br>STM32F103RE<br>STM32F103RF<br>STM32F103RG | Generic Board | *1.9.0* |  |
 | :green_heart:  | STM32F103T4<br>STM32F103T6<br>STM32F103T8<br>STM32F103TB | Generic Board | *1.9.0* |  |
 | :green_heart:  | STM32F103V8<br>STM32F103VB<br>STM32F103VC<br>STM32F103VD<br>STM32F103VE<br>STM32F103VF<br>STM32F103VG | Generic Board | *1.9.0* |  |
 | :green_heart:  | STM32F103ZC<br>STM32F103ZD<br>STM32F103ZE<br>STM32F103ZF<br>STM32F103ZG | Generic Board | *1.9.0* |  |