[Keyboard] Add Rubi Numpad (#12283)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/rubi/info.json

@@ -0,0 +1,31 @@
+{
+   "keyboard_name": "Rubi",
+   "url": "https://github.com/ohchiko/qmk_firmware/tree/master/keyboards/rubi",
+   "maintainer": "gregorio",
+   "width": 4,
+   "height": 5,
+   "layouts": {
+      "LAYOUT": {
+         "layout": [
+            {"x":3, "y":0},
+            {"x":0, "y":1.25},
+            {"x":1, "y":1.25},
+            {"x":2, "y":1.25},
+            {"x":3, "y":1.25},
+            {"x":0, "y":2.25},
+            {"x":1, "y":2.25},
+            {"x":2, "y":2.25},
+            {"x":3, "y":2.25, "h":2},
+            {"x":0, "y":3.25},
+            {"x":1, "y":3.25},
+            {"x":2, "y":3.25},
+            {"x":0, "y":4.25},
+            {"x":1, "y":4.25},
+            {"x":2, "y":4.25},
+            {"x":3, "y":4.25, "h":2},
+            {"x":0, "y":5.25, "w":2},
+            {"x":2, "y":5.25}
+         ]
+      }
+   }
+}