added ymdk ymd09 keyboard (#7831)

* added ymdk ymd09 keyboard

* lowercase github username

* change rgb keymap to make more sense

* fixed number of LEDs

* remove configuration for non-existant backlight

* use official template and change file permissions

* disable unnecessary nkro

* Apply suggestions from code review

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

* with easy reset via bootmagic lite, remove RESET from layout

Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/ymdk/ymd09/info.json

@@ -0,0 +1,23 @@
+{
+    "keyboard_name": "YMD09",
+    "url": "https://www.aliexpress.com/item/4000510880374.html",
+    "maintainer": "kaeltis",
+    "width": 3,
+    "height": 3,
+    "layouts": {
+        "LAYOUT": {
+            "key_count": 9,
+            "layout": [
+                {"label": "7", "x": 0, "y": 0},
+                {"label": "8", "x": 1, "y": 0},
+                {"label": "9", "x": 2, "y": 0},
+                {"label": "4", "x": 0, "y": 1},
+                {"label": "5", "x": 1, "y": 1},
+                {"label": "6", "x": 2, "y": 1},
+                {"label": "1", "x": 0, "y": 2},
+                {"label": "2", "x": 1, "y": 2},
+                {"label": "3", "x": 2, "y": 2}
+            ]
+        }
+    }
+}