Picture and details update

I fixed the picture of the layout and added a bit of an explanation. It now matches the readme file from the uppercase BASE folder

keyboards/xd60/keymaps/base/readme.md

@@ -1,9 +1,5 @@
-# Default Keymap for XIUDI's 60% XD60 PCB
+![Uses this layout](https://i.redd.it/v64eqwsrk8jx.jpg)
 
-![Default Keymap for XD60](https://img.alicdn.com/imgextra/i1/1713761720/TB2K0gTalPxQeBjy1XcXXXHzVXa_!!1713761720.png)
+All of the keys which CAN have a function should be assigned one.
 
-## Additional Notes
+The keys with KC_NO cannot be assigned a value
-Default Keymap for XD60 as indicated on the original sale page.
-
-## Build
-To build the default keymap, simply run `make xd60-default`.