Added PewPew M4, STM32F411, and STM32F412 boards

_board/pewpew_m4.md

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+---
+layout: download
+board_id: "pewpew_m4"
+title: "PewPew M4 Download"
+name: "PewPew M4"
+manufacturer: "Radomir Dopieralski"
+board_url: "https://hackaday.io/project/165032-pewpew-m4"
+board_image: "pewpew_m4.jpg"
+features:
+  - Display
+  ---
+
+Also known as the PewPew Standalone, this board was designed to 
+be a balance between size, simplicity, ease of use, functionality and,
+last but not least, price.
+
+## Learn More
+* [Hackaday.io](https://hackaday.io/project/165032-pewpew-m4)
+
+## Contribute
+
+Have some info to add for this board? Edit the source for this page [here](https://github.com/adafruit/circuitpython-org/edit/master/_board/{{ page.board_id }}.md).

_board/stm32f411.md

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+---
+layout: download
+board_id: "stm32f411"
+title: "Discovery kit for STM32F411 Download"
+name: "Discovery kit for STM32F411"
+manufacturer: "ST"
+board_url: "https://www.st.com/en/evaluation-tools/32f411ediscovery.html"
+board_image: "stm32f411.jpg"
+features:
+  - Accelerometer/Gyroscope
+  - Microphone
+  - Audio Amplifier
+---
+
+The Discovery kit for STM32F411 line helps you to discover the entry level microcontrollers of the STM32 F4 series and to develop your applications easily. It offers everything required for beginners and experienced users to get started quickly.
+
+Based on the STM32F411VET6, it includes an ST-LINK/V2 embedded debug tool, a gyroscope, an e-compass and digital microphone ST MEMs, an audio DAC with an integrated class D speaker driver, an OTG micro-AB connector, LEDs and push-buttons.
+
+## Purchase
+* [ST](https://www.st.com/en/evaluation-tools/32f411ediscovery.html)
+
+## Contribute
+
+Have some info to add for this board? Edit the source for this page [here](https://github.com/adafruit/circuitpython-org/edit/master/_board/{{ page.board_id }}.md).

_board/stm32f412.md

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+---
+layout: download
+board_id: "stm32f412"
+title: "STM32F412 Discovery kit Download"
+name: "STM32F412 Discovery kit"
+manufacturer: "ST"
+board_url: "https://www.st.com/en/evaluation-tools/32f412gdiscovery.html"
+board_image: "stm32f412.jpg"
+features:
+  - TFT Touchscreen
+  - Microphone
+  - Audio Amplifier
+---
+
+The STM32F412 Discovery kit (32F412GDISCOVERY) allows users to easily develop applications with the STM32F412 high performance MCUs with ARM® Cortex®-M4 core.
+
+The Discovery kit combines STM32F412 features with 1.54 inch 240x240 pixel TFT color LCD with touchscreen, LEDs, Wakeup button, I2S Audio Codec, MEMS microphones, USB OTG FS, Quad-SPI NOR Flash memory, MicroSD™ card connector.
+
+An embedded ST-LINK/V2-1 debugger/programmer is included; specialized add-on boards can be connected thanks to the Arduino™ Uno or to the expansion connectors.
+
+## Purchase
+* [ST](https://www.st.com/en/evaluation-tools/32f412gdiscovery.html)
+
+## Contribute
+
+Have some info to add for this board? Edit the source for this page [here](https://github.com/adafruit/circuitpython-org/edit/master/_board/{{ page.board_id }}.md).