[Keyboard] move @monksoffunk 's boards into 25keys/ (#15789)

keyboards/25keys/zinc/rules.mk

@@ -0,0 +1,25 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no       # Mouse keys
+EXTRAKEY_ENABLE = no       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
+AUDIO_ENABLE = no           # Audio output
+RGBLIGHT_ENABLE = no       # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
+RGB_MATRIX_ENABLE = no
+RGB_MATRIX_DRIVER = WS2812
+
+DEFAULT_FOLDER = 25keys/zinc/rev1
+
+#SRC += i2c.c
+SRC += serial.c