[Keyboard] Add Ortho Slayer (#25099)

* Add Ortho Slayer

* Update keyboards/keyten/ortho_slayer/keymaps/default/keymap.c

Co-authored-by: jack <jack@pngu.org>

* Update keyboards/keyten/ortho_slayer/readme.md

Co-authored-by: jack <jack@pngu.org>

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Co-authored-by: jack <jack@pngu.org>

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diff --git a/keyboards/keyten/ortho_slayer/readme.md b/keyboards/keyten/ortho_slayer/readme.md
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+# keyten x La-Versa Ortho Slayer
+
+Ortho Slayer is a full size FRL ortho keyboard inspired by Berserk
+
+![Ortho Slayer image](https://i.imgur.com/CGYysPM.jpeg)
+
+* Keyboard Maintainer: [keyten](https://github.com/key10iq)
+* Hardware Supported: keyten x La-Versa Ortho Slayer
+* Hardware Availability: private GB
+
+Make example for this keyboard (after setting up your build environment):
+
+    make keyten/ortho_slayer:default
+	
+Flashing example for this keyboard:
+
+    make keyten/ortho_slayer: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
+* Physical reset button: Hold the button on the back of the PCB