[Keyboard] move/rename obro to Meridian RGB (#16828)

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

keyboards/primekb/meridian_rgb/rules.mk

@@ -0,0 +1,18 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes     # Enable Bootmagic
+MOUSEKEY_ENABLE = no       # Mouse keys
+EXTRAKEY_ENABLE = yes      # Audio control and System control
+CONSOLE_ENABLE = yes       # 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
+RGBLIGHT_ENABLE = yes      # Enable keyboard RGB underglow
+AUDIO_ENABLE = no          # Audio output