[Keyboard] Adding AEK64 keyboard (#6725)

* Adding AEK64 keyboard

* Deleting useless layout definition

* Resolving many code review issues

* Documenting my 4sStylZ keymap

* Adding default keymap

* Apply suggestions from code review

Code review corrections

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/handwired/aek64/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Correcting the NKRO implementation

keyboards/handwired/aek64/rules.mk

@@ -0,0 +1,29 @@
+# Target file name (without extension).
+
+# project specific files
+
+# MCU name
+MCU = at90usb1286
+
+# Boot Section Size in *bytes*
+#   Teensy halfKay   512
+#   Teensy++ halfKay 1024
+#   Atmel DFU loader 4096
+#   LUFA bootloader  4096
+#   USBaspLoader     2048
+BOOTLOADER = halfKay
+
+# Build Options
+#   change to no 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   = yes # Console for debug(+400)
+COMMAND_ENABLE   = yes # Commands for debug and configuration
+SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
+NKRO_ENABLE      = no  # USB Nkey Rollover - not yet supported in LUFA
+UNICODE_ENABLE   = yes # Enable support for arrow keys icon on the second layer.
+COMBO_ENABLE     = yes # Enable combo for special function when using multiple keys at once.
+TAP_DANCE_ENABLE = no  # Enable use multiple tap
+NKRO_ENABLE      = yes