[Keyboard] Add the Octopad (#9946)

* Create Alter folder

* Revert "Create Alter folder"

This reverts commit 361103b821dbb22957b66cdedb0d11f996def71c.

* Add octopad folder

* Added a new keyboard, the Octopad

* Edited files based on requested changes

* Moved encoder code in keyboard level

* Updated the readme

* Corrected the rows and columns of encoders on config.h

* Changed the Vendor ID to D812 since the first one was already taken

* Added support for ast1109MLTRQ speakers

* Increased number of layers to 8 on VIA keymap

* Edited files based on comments

* Edited rules.mk as per comment

* Edited readme.md as per comment

keyboards/nightly_boards/octopad/octopad.h

@@ -0,0 +1,39 @@
+/* Copyright 2020 Neil Brian Ramirez
+ *
+ * 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"
+#include "encoder_action.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+    E00A, K04,   E00B,  E01A, K14,  E01B, \
+    K00,  K01,   K02,   K03,    \
+    K10,  K11,   K12,   K13    \
+\
+) { \
+    { K00,   K01,   K02,    K03,    K04   }, \
+    { K10,   K11,   K12,    K13,    K14   }, \
+    { E00A,  E00B,  E01A,   E01B,   KC_NO }  \
+}