Add Junco Keyboard (#19516)

keyboards/junco/readme.md

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+# Junco <!-- omit from toc -->
+
+![Junco](https://i.imgur.com/WzZaIgQh.jpg)
+
+Junco is a 60% Raspberry Pi Pico powered split keyboard boasting a 4x6 layout with an aggressive columnar stagger. It has 5 "thumb" keys on either side, support for 2-4 rotary encoders, and per-key RGB lighting.
+
+- Keyboard Maintainer: [Dane Skalski](https://github.com/Daneski13)
+- Hardware Supported: Junco PCB, Raspberry Pi Pico
+- Hardware Availability: [PCB, Case, Parts List](https://github.com/Daneski13/Junco)
+
+Remember you have to flash both halves of the keyboard for it to work!
+
+Make example for this keyboard (after setting up your build environment):
+
+    make junco:default
+
+Flashing example for this keyboard:
+
+```bash
+# For flashing the left half...
+make junco:default:uf2-split-left
+# or the qmk cli equivalent:
+qmk flash -kb junco --keymap default -bl uf2-split-left
+
+# For flashing the right half...
+make junco:default:uf2-split-right
+# or the qmk cli equivalent:
+qmk flash -kb junco --keymap default -bl uf2-split-right
+```
+
+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 <!-- omit from toc -->
+
+Enter the bootloader in 3 ways:
+
+- **Bootmagic reset** (works after you have flashed once): Hold down the top far corner key while plugging in the keyboard (`~` left half, `-` right half). This will also clear the EEPROM.
+- **Physical reset button**: Hold the `BOOT` button on the Pico and press the `RST` button on the Pico, release the the `RST` button before the `BOOT` button.
+- **Keycode in layout**: In the default layout, the `Bootloader` keycode is above home row pinky on the right side's adjust layer.
+
+Once you enter the bootloader, the keyboard will show up as a USB device on your computer, you could drag and drop a firmware file to flash it, but I recommend using the flash commands for the respective side.