[Keyboard] Add KPrepublic BM60hsrgb_iso/rev2, acting in lieu of @bdtc123 (#15095)

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

keyboards/kprepublic/bm60hsrgb_iso/rev2/rules.mk

@@ -0,0 +1,31 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = yes           # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+AUDIO_ENABLE = no           # Audio output
+LTO_ENABLE = yes
+
+
+# RGB Matrix is required to support per-key LEDs connected to IS31FL3733.
+RGB_MATRIX_ENABLE = yes
+
+# The custom RGB Matrix driver combines IS31FL3733 and WS2812; things that are
+# normally done by common_features.mk for both of these drivers need to be done
+# here manually.
+RGB_MATRIX_DRIVER = custom
+COMMON_VPATH += $(DRIVER_PATH)/led/issi
+SRC += is31fl3733.c
+QUANTUM_LIB_SRC += i2c_master.c
+WS2812_DRIVER_REQUIRED = yes