[Keyboard] Add glacier in creatkeebs folder (#16079)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/creatkeebs/glacier/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 Lite
+MOUSEKEY_ENABLE = yes     # Mouse keys
+EXTRAKEY_ENABLE = yes     # Audio control and System control
+CONSOLE_ENABLE = no       # Console for debug
+COMMAND_ENABLE = yes      # Commands for debug and configuration
+NKRO_ENABLE = no          # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no     # Enable keyboard backlight functionality
+AUDIO_ENABLE = no         # Enable keyboard RGB underglow
+RGBLIGHT_ENABLE = no      # Audio output