[Keyboard] Add LAYOUT_60_iso to XD60 (#7263)

* refactor iso keymap

- remove redundant action_layer.h include
- use enum for layer management
- QMK coding conventions (four-space indent)

* add LAYOUT_60_iso macro

* enable 60_iso community layout for both revisions

* swap KC_HOME to KC_RSFT

* update ISO keymap readme

* update default keymap readme

`make` command no longer valid.

* refactor keyboard readme

Update to reflect current QMK template.

* add LAYOUT_60_iso data to info.json

* use #pragma once in header files

1 files changed, 15 insertions, 4 deletions

diff --git a/keyboards/xd60/keymaps/iso/readme.md b/keyboards/xd60/keymaps/iso/readme.md
index 82c575d981..84374fa185 100644
--- a/keyboards/xd60/keymaps/iso/readme.md
+++ b/keyboards/xd60/keymaps/iso/readme.md
@@ -1,9 +1,20 @@
 # iso Keymap for XIUDI's 60% XD60 PCB
 
-![iso Keymap for XD60]()
-
-## Additional Notes
 iso Keymap for XD60.
 
+## Keymap
+
+### Base Layer
+
+![Layer 0](https://raw.githubusercontent.com/noroadsleft/qmk_images/master/keyboards/xd60/keymaps/iso/layer0.png)
+
+### Function Layer
+
+![Layer 1](https://raw.githubusercontent.com/noroadsleft/qmk_images/master/keyboards/xd60/keymaps/iso/layer1.png)
+
 ## Build
-To build the default keymap, simply run `make xd60:iso`.
+
+To build the default keymap, simply run:
+
+    make xd60/rev2:iso  # XD60 rev2
+    make xd60/rev3:iso  # XD60 rev3