[Keyboard] Add Nuxros RE65 (#22078)

Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/sawnsprojects/re65/readme.md

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+# RE65
+
+![RE65](https://i.imgur.com/bzeWSwwh.png)
+
+A Keyboard from Nuxros
+
+* Keyboard Maintainer: [Mai The San](https://github.com/maithesan)
+* Hardware Supported: RE65, KBD67 MKII
+* Hardware Availability: [Nuxros Store](https://nuxroskb.store/en/products/re65?variant=45628371370283)
+Make example for this keyboard (after setting up your build environment):
+
+    make sawnsprojects/re65:default
+
+Flashing example for this keyboard:
+
+    make sawnsprojects/re65: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 short the `RST` and `GND` pads on the SWD header twice, or short the `BOOT` header and plug in keyboard
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available