examples/Keyboardio/Atreus: Add a Model01-style version info macro

Add a Model01-style version info macro (which types `Keyboardio Atreus -
$version`) to UPPER+Z.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

examples/Devices/Keyboardio/Atreus/Atreus.ino

@@ -17,6 +17,10 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#ifndef BUILD_INFORMATION
+#define BUILD_INFORMATION "locally built"
+#endif
+
 #include "Kaleidoscope.h"
 #include "Kaleidoscope-EEPROM-Settings.h"
 #include "Kaleidoscope-EEPROM-Keymap.h"
@@ -33,7 +37,8 @@
 #define TG(n) LockLayer(n)
 
 enum {
-  MACRO_QWERTY
+  MACRO_QWERTY,
+  MACRO_VERSION_INFO
 };
 
 #define Key_Exclamation LSHIFT(Key_1)
@@ -84,7 +89,7 @@ KEYMAPS(
   (
        Key_Insert            ,Key_Home                 ,Key_UpArrow   ,Key_End        ,Key_PageUp
       ,Key_Delete            ,Key_LeftArrow            ,Key_DownArrow ,Key_RightArrow ,Key_PageDown
-      ,XXX                 ,Consumer_VolumeIncrement ,XXX           ,XXX            ,___ ,___
+      ,M(MACRO_VERSION_INFO) ,Consumer_VolumeIncrement ,XXX           ,XXX            ,___ ,___
       ,MoveToLayer(QWERTY)   ,Consumer_VolumeDecrement ,___           ,___            ,___ ,___
 
                 ,Key_UpArrow   ,Key_F7              ,Key_F8          ,Key_F9         ,Key_F10
@@ -117,6 +122,12 @@ const macro_t *macroAction(uint8_t macroIndex, uint8_t keyState) {
     // the macro in EEPROM, it will keep working after a firmware update.
     Layer.move(QWERTY);
     break;
+  case MACRO_VERSION_INFO:
+    if (keyToggledOn(keyState)) {
+      Macros.type(PSTR("Keyboardio Atreus - Kaleidoscope "));
+      Macros.type(PSTR(BUILD_INFORMATION));
+    }
+    break;
   default:
     break;
   }