[Keymap] German Corne Layout (#17268)

* added german corne

* added symbol layer

* Delete settings.json

revert setting

* Delete keymap.c

* Update config.h

* Update keycodes.h

* Update config.h

* Update keyboards/crkbd/keymaps/JulianTurner/oled.c

* Update keycodes.h

* Update oled.c

added header

* Update keymap.c

added header

* Update keytabs.h

added header

* Update readme.md

* Update rules.mk

* default settings

* Update settings.json

* renamed folder

* revert

* remove c file import and added to rules

* Update keymap.c

* Update keymap.c

* Update readme.md

* Update rules.mk

* updated files from pull request

* fixed issues with merge

* Update keyboards/crkbd/keymaps/julian_turner/oled.c

* Update keyboards/crkbd/keymaps/julian_turner/rules.mk

* Update keyboards/crkbd/keymaps/julian_turner/keymap.c

* Delete keycodes.h

* Update keyboards/crkbd/keymaps/julian_turner/readme.md

keyboards/crkbd/keymaps/julian_turner/readme.md

@@ -0,0 +1,5 @@
+# JulianTurner´s CRKBD Layout
+
+## Compile
+
+Compile using `qmk compile -kb crkbd -km julian_turner` for Pro Micro