[keyboard] adding keyboard: jerkin (#7975)

* jerkin

* Update config.h

* Apply suggestions from code review

Co-Authored-By: Drashna Jaelre <drashna@live.com>
Co-Authored-By: Akaash Suresh <casa.akaash@gmail.com>

* Update rules.mk

* Apply suggestions from code review

* Missing closing parenthesis in one of the suggestions.

* Finalize collaborator suggestions

* One final tweak to standardize MANUFACTURER

Co-authored-by: ridingqwerty <george.g.koenig@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Akaash Suresh <casa.akaash@gmail.com>

keyboards/wsk/jerkin/rules.mk

@@ -0,0 +1,29 @@
+# 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 = no       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+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 = yes           # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+AUDIO_ENABLE = no           # Audio output on port C6
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow