[Keyboard] Add rart/rart4x4 with VIA support (#11095)

* Create config.h

* Create info.json

* Create rart4x4.c

* Create rart4x4.h

* Create readme.md

* Create rules.mk

* Create keymap.c

* Create keymap.c

* Rename keyboards/rart/rart4x4/default/keymap.c to keyboards/rart/rart4x4/keymaps/default/keymap.c

* Rename keyboards/rart/rart4x4/via/keymap.c to keyboards/rart/rart4x4/keymaps/via/keymap.c

* Create rules.mk

* Update info.json

* Update keymap.c

* Update rart4x4.h

* Update rules.mk

keyboards/rart/rart4x4/info.json

@@ -0,0 +1,32 @@
+{
+  "keyboard_name": "RART4X4",
+  "url": "",
+  "maintainer": "Alabahuy",
+  "width": 4,
+  "height": 4,
+  "layouts": {
+      "LAYOUT_ortho_4x4": {
+            "layout": [
+                {"label": "Numlock", "x": 0, "y": 0},
+                {"label": "/", "x": 1, "y": 0},
+                {"label": "*", "x": 2, "y": 0},
+                {"label": "-", "x": 3, "y": 0},
+                
+                {"label": "7", "x": 0, "y": 1},
+                {"label": "8", "x": 1, "y": 1},
+                {"label": "9", "x": 2, "y": 1},
+                {"label": "=", "x": 3, "y": 1},
+                
+                {"label": "4", "x": 0, "y": 2},
+                {"label": "5", "x": 1, "y": 2},
+                {"label": "6", "x": 2, "y": 2},
+                {"label": "+", "x": 3, "y": 2},
+                
+                {"label": "1", "x": 0, "y": 3},
+                {"label": "2", "x": 1, "y": 3},
+                {"label": "3", "x": 2, "y": 3},
+                {"label": "Esc", "x": 3, "y": 3},
+            ]
+      }
+  }
+}