[Keyboard] Inital port of xd96 (#5401)

* Initial import of xd96 based on xd84 code

* Configure xd96 port expander mapping

* Fix xd96 led count

* Fix xd96 port expander reading

* Fix xd96 port expander reading

* Fix xd96 LAYOUT matrix mapping

* Add additional links for xd96 Hardware Availability

* Correct Configurator config

Co-Authored-By: zvecr <git@zvecr.com>

* Readme review comments

Co-Authored-By: zvecr <git@zvecr.com>

keyboards/xd96/readme.md

@@ -0,0 +1,22 @@
+# XD96
+
+![XD96](https://cdn.shopify.com/s/files/1/2711/4238/products/xd96_pcb_1024x1024.jpg?v=1515425370)
+
+Compact With 96 Keys & RGB LED Underglow
+- Designed by Xiudi
+- ISO and ANSI support
+- Uses Kimera core
+
+Keyboard Maintainer: QMK Community  
+Hardware Supported: XD96  
+Hardware Availability: [KPrepublic](https://kprepublic.com/products/xd96-pcb-90-custom-mechanical-keyboard-supports-tkg-tools-underglow-rgb-programmed); [AliExpress](https://aliexpress.com/item/cospad-Custom-Mechanical-Keyboard-Kit-up-tp-24-keys-Supports-TKG-TOOLS-Underglow-RGB-PCB-20/32818383873.html)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make xd96:default
+
+Install examples:
+
+    make xd96:default:dfu
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).