[Keyboard] XD68 65% ATMega32U4 based (#7395)

* First working draft

* Updated readme.md

* Fixed url

* Typo fix

* RGB + Backlight working

* Fixed matrix for ISO NUHS

* ISO matrix working

* Adding ANSI default layout

* First release commit

* Removed reference to deprecated layout

* Changes from PR #7395 review

* Additional changes as requested for PR #7395

* Additional changes from @noroadsleft review

* Replaced ifndef/endif with pragma

* Adding yanfali's recommended changes

keyboards/xd68/keymaps/default/readme.md

@@ -0,0 +1,5 @@
+# XD68 layout for Default ANSI
+
+```
+make xd68:default
+```