[Keyboard] adding keyboard: pain27 (#7977)

* pain27

* Applied review suggestions

* Correct DEBOUNCE verbiage, remove .ini files

* Readme tweaks

Co-authored-by: ridingqwerty <george.g.koenig@gmail.com>

keyboards/wsk/pain27/rules.mk

@@ -0,0 +1,26 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
+BOOTLOADER = caterina
+
+# Build Options
+#   comment out to disable the options.
+#
+BOOTMAGIC_ENABLE = yes # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = yes  # 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
+SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
+NKRO_ENABLE = yes      # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no  # Enable keyboard backlight functionality
+AUDIO_ENABLE = no
+RGBLIGHT_ENABLE = yes