[Keyboard] Add macro3 PCB support (#15131)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: filterpaper <filterpaper@localhost>

1 files changed, 26 insertions, 0 deletions

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+# Macro3
+
+![Macro3](https://github.com/davidphilipbarr/Macropads/raw/main/macro3/IMG_20200703_170424.jpg)
+
+Macro3 is a low-profile macro pad with encoder support designed by [@davidphilipbarr](https://github.com/davidphilipbarr) using direct micro-controller pin wiring.
+
+## Keyboard Info
+
+* Keyboard Maintainer: [davidphilipbarr](https://github.com/davidphilipbarr)
+* Hardware Supported: [Macro3](https://github.com/davidphilipbarr/Macropads/tree/main/macro3)
+* Hardware Availability: order PCBs with gerber file from the repository
+
+Make example for this keyboard (after setting up your build environment):
+
+    make macro3:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the top right key and plug in the controller.
+* **Physical reset button**: Briefly press the reset button soldered on the PCB.
+* **Keycode in layout**: Press the key mapped to `RESET` if it is configured.
+