[Keyboard] Add Dozen0 (#5272)

* Add Dozen0 macropad

* Fix readme image

* Add info.json

* Fix keymap f12

* Fix copyright and replace include guards

* remove IS_COMMAND at config.h

keyboards/dozen0/info.json

@@ -0,0 +1,16 @@
+{
+  "keyboard_name": "Dozen0",
+  "url": "http://yynmt.com",
+  "maintainer": "yynmt",
+  "width": 6,
+  "height": 2,
+  "layouts": {
+    "LAYOUT": {
+      "key_count": 12,
+      "layout": [
+        {"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0}, {"x":3, "y":0}, {"x":4, "y":0}, {"x":5, "y":0},
+        {"x":0, "y":1}, {"x":1, "y":1}, {"x":2, "y":1}, {"x":3, "y":1}, {"x":4, "y":1}, {"x":5, "y":1}
+      ]
+    }
+  }
+}