[Keyboard] Add nullbitsco SCRAMBLE (#11078)

* Add SCRAMBLE

* Make requested changes to PR

* Add all layers to VIA keymap

Implement drashna's PR feedback in order to avoid random data within the layers in VIA.

* Make requested changes to PR

Implement fauxpark's PR feedback to clean up readme.md and rules.mk.

* Make changes based on PR feedback

-Changed VIA layers to enum
-Added info on how to enter the bootloader to readme

keyboards/nullbitsco/scramble/info.json

@@ -0,0 +1,39 @@
+{
+    "keyboard_name": "SCRAMBLE switch tester",
+    "keyboard_folder": "nullbitsco/scramble",
+    "url": "https://nullbits.co/scramble",
+    "maintainer": "jaygreco",
+    "width": 3,
+    "height": 2,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {
+                    "label": "n",
+                    "x": 0,
+                    "y": 0
+                },
+                {
+                    "x": 1,
+                    "y": 0
+                },
+                {
+                    "x": 2,
+                    "y": 0
+                },
+                {
+                    "x": 0,
+                    "y": 1
+                },
+                {
+                    "x": 1,
+                    "y": 1
+                },
+                {
+                    "x": 2,
+                    "y": 1
+                }
+            ]
+        }
+    }
+}