Add support for the Jiran (#1048)

* initial files to get stuff working

* Keymap by Ladniy

* Format update to new standards

* keymap update

* header

* Fixed transform, removed left and right .conf files

* Apply suggestions from code review

Formatting

Co-authored-by: Nick Winans <nick@winans.codes>

Co-authored-by: Nick Winans <nick@winans.codes>

app/boards/shields/jiran/jiran.zmk.yml

@@ -0,0 +1,11 @@
+file_format: "1"
+id: jiran
+name: Jiran
+type: shield
+url: https://github.com/Ladniy/jiran
+requires: [pro_micro]
+features:
+  - keys
+siblings:
+  - jiran_left
+  - jiran_right