[Keyboard] Add ReverseStudio-DecadePad (#8553)

* ADD DecadePad

* Fix Key display bug

* fix

* firmware1

THIS IS A Backup commit

* firmware2

* rename all fill with lower case

* fix bug

* Final Version

Fix all bugs

* Requested change apply

* suggested apply

* change apply

* via test

* Apply change and fix via support problem

keyboards/reversestudio/decadepad/info.json

@@ -0,0 +1,40 @@
+{
+    "keyboard_name": "DecadePad",
+    "url": "",
+    "maintainer": "huajijam",
+    "width": 6,
+    "height": 4,
+    "layouts": {
+        "LAYOUT_numpad_6x4": {
+            "key_count": 21,
+            "layout": [
+                {"x":0, "y":0},
+                {"x":1, "y":0},
+                {"x":2, "y":0},
+                {"x":3, "y":0},
+
+                {"x":0, "y":1},
+                {"x":1, "y":1},
+                {"x":2, "y":1},
+                {"x":3, "y":1},
+
+                {"x":0, "y":2},
+                {"x":1, "y":2},
+                {"x":2, "y":2},
+
+                {"x":0, "y":3},
+                {"x":1, "y":3},
+                {"x":2, "y":3},
+                {"x":3, "y":2, "h":2},
+
+                {"x":0, "y":4},
+                {"x":1, "y":4},
+                {"x":2, "y":4},
+                
+                {"x":0, "y":5, "w":2},
+                {"x":2, "y":5},
+                {"x":3, "y":4, "h":2}
+            ]
+        }
+    }
+}