[Keyboard] jaykeeb skyline (#21219)

keyboards/jaykeeb/skyline/readme.md

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+#Skyline
+
+![skyline](https://i.imgur.com/nIeOhKth.png)
+
+PCB for "Skyline" TKL Mechanical Keyboard
+
+* Keyboard Maintainer: [Alabahuy](https://github.com/alabahuy)
+* Hardware Supported: Skyline PCB, RP2040
+* Hardware Availability: Private GB
+
+Make example for this keyboard (after setting up your build environment):
+
+    make jaykeeb/skyline:default
+
+Flashing example for this keyboard ([after setting up the bootloadHID flashing environment](https://docs.qmk.fm/#/flashing_bootloadhid))
+
+    make jaykeeb/skyline:default:flash
+
+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 key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available