[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/scramble.h

@@ -0,0 +1,39 @@
+/* Copyright 2020 Jay Greco
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+// Indication LED settings
+#define LED_ON          2
+#define LED_DIM         1
+#define LED_OFF         0
+
+#define GPIO_STATE_LOW  0
+#define GPIO_STATE_HIGH 1
+
+#define PIN_LED         B2
+
+void set_scramble_LED(uint8_t mode);
+
+#define LAYOUT( \
+    K01, K02, K03, \
+    K11, K12, K13  \
+) { \
+   {K01, K02, K03}, \
+   {K11, K12, K13}, \
+}