[Keyboard] Add Binepad BNR1 rotary encoder (#18809)

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

keyboards/binepad/bnr1/readme.md

@@ -0,0 +1,23 @@
+# BINEPAD BNR1
+
+The BNR1 is a multifunction knob, which can be rotated, pressed, and rotated while pressed.
+
+* Keyboard Maintainer: [Binpad](https://github.com/binepad)
+* Hardware Supported: **BNR1** & **BNR1 R2** *("V1" ft. ATMega32u4 MCU)*
+* Hardware Availability: [Binepad.com](https://www.binepad.com/bnr1)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make binepad/bnr1/v1:default
+
+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 knob while plugging in the keyboard's USB cable
+* **Physical reset button**: Briefly press the button on the underside of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` *(or `RESET`)* if it is available