[Keymap] dz60 Iso de 5x1u split right shift (#6889)

* add ISO-DE layout with 5x1u and split right shift

* cleaning up

* renamed readme.md and layout. added underglow

* change layout name in info.json

* rename readme.md

* renamed layout in comment. added rgb keys to visualisation

* change Layout name in dz60.h visualization

keyboards/dz60/keymaps/iso_de_root/rules.mk

@@ -0,0 +1,15 @@
+# Build Options
+#   comment out to disable the options.
+#
+BOOTMAGIC_ENABLE = no	# 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
+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
+AUTO_SHIFT_ENABLE = no  # If the time depressed is greater than or equal to the AUTO_SHIFT_TIMEOUT, then a shifted version of the key is emitted. If the time is less than the AUTO_SHIFT_TIMEOUT time, then the normal state is emitted
+TAP_DANCE_ENABLE = no