[Keyboard] Add DP60 keyboard (#6679)

* add dp60 keyboard

* fixup wording in readme

* fix layout name in default keymap. I was missing an r

* Add QMK Configurator support for the additional layouts

* Update keyboards/dp60/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/dp60/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/dp60/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/dp60/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update keyboards/dp60/config.h

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* strip out the VIA enabling from default rules.mk

* add a VIA only keymap

keyboards/dp60/rules.mk

@@ -0,0 +1,45 @@
+# MCU name
+MCU = atmega32u4
+
+# Interrupt driven control endpoint task(+60)
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
+# Boot Section Size in *bytes*
+#   Teensy halfKay   512
+#   Teensy++ halfKay 1024
+#   Atmel DFU loader 4096
+#   LUFA bootloader  4096
+#   USBaspLoader     2048
+BOOTLOADER = atmel-dfu
+#OPT_DEFS += -DBOOTLOADER_SIZE=4096
+
+# Do not put the microcontroller into power saving mode
+# when we get USB suspend event. We want it to keep updating
+# backlight effects.
+#OPT_DEFS += -DNO_SUSPEND_POWER_DOWN
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
+MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+#RGBLIGHT_ENABLE = yes       # Use RGB bottom light
+RGB_MATRIX_ENABLE = yes     # Use RGB matrix
+
+LAYOUTS = 60_ansi 60_hhkb 60_iso 60_ansi_split_bs_rshift
+
+CUSTOM_MATRIX = yes
+SRC += matrix.c