[keyboard] Add [n]2 support (#9862)

* Create Alter folder

* Revert "Create Alter folder"

This reverts commit 361103b821dbb22957b66cdedb0d11f996def71c.

* Add n2 keyboard

* Apply suggestions from code review

Edited config.h, keymap.c, readme.md, and rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update readme.md

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/nightly_boards/n2/keymaps/default/keymap.c

@@ -0,0 +1,23 @@
+/* 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/>.
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(
+        KC_L,
+        KC_O
+    )
+};