[Keyboard] Add Arch-36 keyboard (#9688)

* Add Arch-36 keyboard

* Apply suggestions from code review

Update based on PR Review comments

* Apply suggestions from code review

Update to PR comments

* Fix Build

* Use full rules.mk template for Arch-36 keyboard

* Reduce default firmware size

* Update based on PR comments

* Fix Copyright statement on arch_36:obosob keymap

* Apply suggestions from code review

keyboards/arch_36/rules.mk

@@ -0,0 +1,26 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+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 = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes      # Enable keyboard RGB underglow
+OLED_DRIVER_ENABLE = yes    # Enables the use of OLED displays
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
+SPLIT_KEYBOARD = yes       # Split common
+
+LAYOUTS = split_3x5_3