[Keyboard] Add the Gone Hacking Studio XLS (#19185)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/ghs/xls/readme.md

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+# GHS.XLS
+
+![GHS.XLS](https://i.imgur.com/5g5kw2sl.jpg)
+
+The perfect partner numpad with the GHS.RAR. Can do normal, southpaw, and macro layouts.
+
+* Keyboard Maintainer: [Ramon Imbao](https://github.com/ramonimbao)
+* Hardware Supported: STM32F072
+* Hardware Availability: [Gone Hacking Studio](https://gonehacking.studio/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make ghs/xls:default
+
+Flashing example for this keyboard:
+
+    make ghs/xls: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
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available