hello.
I like arduino_core_stm32.
Can you support stm32f107vct ?

I try new new variant... but difficult...

1. Name : STM32F107VCT
2. LINK :
   https://www.waveshare.com/open107v-standard.htm
3. Documentations
   https://www.waveshare.com/wiki/Open107V
4. Schematics :
   https://www.waveshare.com/w/upload/4/40/Open107V-Schematic.pdf
5. Where this hardware can be purchased :
   https://www.amazon.com/Waveshare-Development-STM32F107VCT6-STM32F107-Cortex-M3/dp/B00KM6W6JK/ref=sr_1_1?keywords=stm32f107&qid=1575415768&sr=8-1

Thank you.

Board description (please complete the following information):

• Name: [e.g. DISCOVERY F769NI]
• Link to all relevant information:
  • Documentations
  • Schematics
  • Where this hardware can be purchased

• ...

Note that user can add a STM32 based board following thiswiki

Any contribution is welcome, so do not hesitate to submit a PR.