[Keyboard] null ST110R2.1 (SaikouType) (#21623)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: user176176 <you@example.com>

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+# null/st110r2
+
+null ST110r2 is a custom PCB/keyboard project that supports multiple layouts and is built on top of the Filco and the clones alike.
+
+![st110r2_zoom](https://s3.amazonaws.com/null-src/images/posts/nkbm-st110r2/NKBM-ST110r21-both1.png)
+![st110r2_full](https://s3.amazonaws.com/null-src/images/posts/nkbm-st110r2/NKBM-ST110r21-both3.png)
+
+* Keyboard Maintainer: [user176176](https://github.com/user176176)
+* Hardware Supported: [null] 最高タイプ (SaikouType) NKBM-ST110r2.x keyboard PCBs with Teensy 2.0++.
+* Hardware Availability: [NKBM-ST110r2 - null-src.com](https://null-src.com/posts/nkbm-st110r2/post.php)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make null/st110r2:default
+
+Flashing example for this keyboard:
+
+    make null/st110r2: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 reset button on Teensy
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
+
+![st110r2_pcb](https://s3.amazonaws.com/null-src/images/posts/nkbm-st110r2/NKBM-ST110r2_PCB.jpg)
+![st110r2_build](https://s3.amazonaws.com/null-src/images/posts/nkbm-st110r2/NKBM-ST110r2.1_rosewill_top.jpg)